Add do not convert for sdk_version unset

When sdk_version is unset, the build with fail with Bazel because
private APIs are do not build with Bazel at this time.

This instead prevents migrating the relevant target to Bazel in bp2build

Test: go tests
Change-Id: I31dabcf143de7933706d1b734ef21467a01b65e9
diff --git a/bp2build/aar_conversion_test.go b/bp2build/aar_conversion_test.go
index 09d9dc1..a24378c 100644
--- a/bp2build/aar_conversion_test.go
+++ b/bp2build/aar_conversion_test.go
@@ -37,19 +37,19 @@
 		},
 		Blueprint: simpleModuleDoNotConvertBp2build("android_library", "static_lib_dep") + `
 android_library {
-        name: "TestLib",
-        srcs: ["lib.java"],
-        arch: {
-			arm: {
-				srcs: ["arm.java"],
-			},
-			x86: {
-				srcs: ["x86.java"],
-			}
+	name: "TestLib",
+	srcs: ["lib.java"],
+	arch: {
+		arm: {
+			srcs: ["arm.java"],
 		},
-        manifest: "manifest/AndroidManifest.xml",
-        static_libs: ["static_lib_dep"],
-        java_version: "7",
+		x86: {
+			srcs: ["x86.java"],
+		}
+	},
+	manifest: "manifest/AndroidManifest.xml",
+	static_libs: ["static_lib_dep"],
+	sdk_version: "current",
 }
 `,
 		ExpectedBazelTargets: []string{
@@ -66,12 +66,9 @@
 					"resource_files": `["res/res.png"]`,
 					"deps":           `[":static_lib_dep"]`,
 					"exports":        `[":static_lib_dep"]`,
-					"java_version":   `"7"`,
+					"sdk_version":    `"current"`, // use as default
 				}),
-			MakeNeverlinkDuplicateTargetWithAttrs(
-				"android_library",
-				"TestLib",
-				AttrNameToString{"java_version": `"7"`}),
+			MakeNeverlinkDuplicateTarget("android_library", "TestLib"),
 		}})
 }
 
@@ -87,10 +84,11 @@
 		},
 		Blueprint: simpleModuleDoNotConvertBp2build("android_library", "lib_dep") + `
 android_library {
-        name: "TestLib",
-        srcs: [],
-        manifest: "AndroidManifest.xml",
-        libs: ["lib_dep"],
+	name: "TestLib",
+	srcs: [],
+	manifest: "AndroidManifest.xml",
+	libs: ["lib_dep"],
+	sdk_version: "current",
 }
 `,
 		ExpectedErr:          fmt.Errorf("Module has direct dependencies but no sources. Bazel will not allow this."),
@@ -121,6 +119,7 @@
         name: "TestImport",
         aars: ["import.aar"],
         static_libs: ["static_lib_dep", "static_import_dep"],
+    sdk_version: "current",
 }
 `,
 			ExpectedBazelTargets: []string{
@@ -133,7 +132,8 @@
         ":static_lib_dep",
         ":static_import_dep",
     ]`,
-						"exports": `[":static_import_dep"]`,
+						"exports":     `[":static_import_dep"]`,
+						"sdk_version": `"current"`, // use as default
 					},
 				),
 				MakeNeverlinkDuplicateTarget("android_library", "TestImport"),
@@ -153,9 +153,10 @@
 		},
 		Blueprint: `
 android_library {
-        name: "TestLib",
-        srcs: ["a.java", "b.kt"],
-        common_srcs: ["c.kt"],
+	name: "TestLib",
+	srcs: ["a.java", "b.kt"],
+	common_srcs: ["c.kt"],
+	sdk_version: "current",
 }
 `,
 		ExpectedBazelTargets: []string{
@@ -170,6 +171,7 @@
 					"common_srcs":    `["c.kt"]`,
 					"manifest":       `"AndroidManifest.xml"`,
 					"resource_files": `[]`,
+					"sdk_version":    `"current"`, // use as default
 				}),
 			MakeNeverlinkDuplicateTarget("android_library", "TestLib"),
 		}})
@@ -186,9 +188,10 @@
 		},
 		Blueprint: `
 android_library {
-        name: "TestLib",
-        srcs: ["a.java", "b.kt"],
-        kotlincflags: ["-flag1", "-flag2"],
+	name: "TestLib",
+	srcs: ["a.java", "b.kt"],
+	kotlincflags: ["-flag1", "-flag2"],
+	sdk_version: "current",
 }
 `,
 		ExpectedBazelTargets: []string{
@@ -206,6 +209,7 @@
     ]`,
 					"manifest":       `"AndroidManifest.xml"`,
 					"resource_files": `[]`,
+					"sdk_version":    `"current"`, // use as default
 				}),
 			MakeNeverlinkDuplicateTarget("android_library", "TestLib"),
 		}})
diff --git a/bp2build/android_app_conversion_test.go b/bp2build/android_app_conversion_test.go
index 8ed94b4..25494a1 100644
--- a/bp2build/android_app_conversion_test.go
+++ b/bp2build/android_app_conversion_test.go
@@ -44,9 +44,9 @@
 		},
 		Blueprint: `
 android_app {
-        name: "TestApp",
-        srcs: ["app.java"],
-        sdk_version: "current",
+		name: "TestApp",
+		srcs: ["app.java"],
+		sdk_version: "current",
 }
 `,
 		ExpectedBazelTargets: []string{
@@ -75,17 +75,17 @@
 		},
 		Blueprint: simpleModuleDoNotConvertBp2build("android_app", "static_lib_dep") + `
 android_app {
-        name: "TestApp",
-        srcs: ["app.java"],
-        sdk_version: "current",
-        package_name: "com.google",
-        resource_dirs: ["resa", "resb"],
-        manifest: "manifest/AndroidManifest.xml",
-        static_libs: ["static_lib_dep"],
-        java_version: "7",
-        certificate: "foocert",
-        required: ["static_lib_dep"],
-        asset_dirs: ["assets_"],
+		name: "TestApp",
+		srcs: ["app.java"],
+		sdk_version: "current",
+		package_name: "com.google",
+		resource_dirs: ["resa", "resb"],
+		manifest: "manifest/AndroidManifest.xml",
+		static_libs: ["static_lib_dep"],
+		java_version: "7",
+		certificate: "foocert",
+		required: ["static_lib_dep"],
+		asset_dirs: ["assets_"],
 }
 `,
 		ExpectedBazelTargets: []string{
@@ -120,16 +120,16 @@
 		},
 		Blueprint: `
 android_app {
-        name: "TestApp",
-        sdk_version: "current",
-        arch: {
-			arm: {
-				srcs: ["arm.java"],
-			},
-			x86: {
-				srcs: ["x86.java"],
-			}
+	name: "TestApp",
+	sdk_version: "current",
+	arch: {
+		arm: {
+			srcs: ["arm.java"],
+		},
+		x86: {
+			srcs: ["x86.java"],
 		}
+	}
 }
 `,
 		ExpectedBazelTargets: []string{
@@ -154,8 +154,9 @@
 		Filesystem:                 map[string]string{},
 		Blueprint: simpleModuleDoNotConvertBp2build("filegroup", "foocert") + `
 android_app {
-        name: "TestApp",
-        certificate: ":foocert",
+	name: "TestApp",
+	certificate: ":foocert",
+	sdk_version: "current",
 }
 `,
 		ExpectedBazelTargets: []string{
@@ -163,6 +164,7 @@
 				"certificate":    `":foocert"`,
 				"manifest":       `"AndroidManifest.xml"`,
 				"resource_files": `[]`,
+				"sdk_version":    `"current"`, // use as default
 			}),
 		}})
 }
@@ -177,8 +179,9 @@
 		},
 		Blueprint: `
 android_app {
-        name: "TestApp",
-        certificate: "foocert",
+	name: "TestApp",
+	certificate: "foocert",
+	sdk_version: "current",
 }
 `,
 		ExpectedBazelTargets: []string{
@@ -186,6 +189,7 @@
 				"certificate":    `"foocert"`,
 				"manifest":       `"AndroidManifest.xml"`,
 				"resource_files": `[]`,
+				"sdk_version":    `"current"`, // use as default
 			}),
 		}})
 }
@@ -200,8 +204,9 @@
 		},
 		Blueprint: `
 android_app {
-        name: "TestApp",
-        certificate: "foocert",
+	name: "TestApp",
+	certificate: "foocert",
+	sdk_version: "current",
 }
 `,
 		ExpectedBazelTargets: []string{
@@ -209,6 +214,7 @@
 				"certificate_name": `"foocert"`,
 				"manifest":         `"AndroidManifest.xml"`,
 				"resource_files":   `[]`,
+				"sdk_version":      `"current"`, // use as default
 			}),
 		}})
 }
@@ -219,22 +225,20 @@
 		ModuleTypeUnderTest:        "android_app",
 		ModuleTypeUnderTestFactory: java.AndroidAppFactory,
 		Filesystem:                 map[string]string{},
-		Blueprint: simpleModuleDoNotConvertBp2build("filegroup", "foocert") + `
+		Blueprint: simpleModuleDoNotConvertBp2build("filegroup", "foocert") +
+			simpleModuleDoNotConvertBp2build("java_library", "barLib") + `
 android_app {
-        name: "foo",
-				libs: ["barLib"]
-}
-java_library{
-       name: "barLib",
+	name: "foo",
+	libs: ["barLib"],
+	sdk_version: "current",
 }
 `,
 		ExpectedBazelTargets: []string{
-			MakeBazelTarget("java_library", "barLib", AttrNameToString{}),
-			MakeNeverlinkDuplicateTarget("java_library", "barLib"),
 			MakeBazelTarget("android_binary", "foo", AttrNameToString{
 				"manifest":       `"AndroidManifest.xml"`,
 				"resource_files": `[]`,
 				"deps":           `[":barLib-neverlink"]`,
+				"sdk_version":    `"current"`, // use as default
 			}),
 		}})
 }
@@ -247,21 +251,18 @@
 		Filesystem: map[string]string{
 			"res/res.png": "",
 		},
-		Blueprint: simpleModuleDoNotConvertBp2build("filegroup", "foocert") + `
+		Blueprint: simpleModuleDoNotConvertBp2build("filegroup", "foocert") +
+			simpleModuleDoNotConvertBp2build("java_library", "barLib") + `
 android_app {
-        name: "foo",
-        srcs: ["a.java", "b.kt"],
-        certificate: ":foocert",
-        manifest: "fooManifest.xml",
-        libs: ["barLib"]
-}
-java_library{
-      name:   "barLib",
+	name: "foo",
+	srcs: ["a.java", "b.kt"],
+	certificate: ":foocert",
+	manifest: "fooManifest.xml",
+	libs: ["barLib"],
+	sdk_version: "current",
 }
 `,
 		ExpectedBazelTargets: []string{
-			MakeBazelTarget("java_library", "barLib", AttrNameToString{}),
-			MakeNeverlinkDuplicateTarget("java_library", "barLib"),
 			MakeBazelTarget("android_library", "foo_kt", AttrNameToString{
 				"srcs": `[
         "a.java",
@@ -270,11 +271,13 @@
 				"manifest":       `"fooManifest.xml"`,
 				"resource_files": `["res/res.png"]`,
 				"deps":           `[":barLib-neverlink"]`,
+				"sdk_version":    `"current"`, // use as default
 			}),
 			MakeBazelTarget("android_binary", "foo", AttrNameToString{
 				"deps":        `[":foo_kt"]`,
 				"certificate": `":foocert"`,
 				"manifest":    `"fooManifest.xml"`,
+				"sdk_version": `"current"`, // use as default
 			}),
 		}})
 }
@@ -289,31 +292,33 @@
 		},
 		Blueprint: simpleModuleDoNotConvertBp2build("filegroup", "foocert") + `
 android_app {
-        name: "foo",
-        srcs: ["a.java"],
-        common_srcs: ["b.kt"],
-        certificate: "foocert",
-        manifest: "fooManifest.xml",
-        libs:        ["barLib"],
+	name: "foo",
+	srcs: ["a.java"],
+	common_srcs: ["b.kt"],
+	certificate: "foocert",
+	manifest: "fooManifest.xml",
+	libs:        ["barLib"],
+	sdk_version: "current",
 }
 java_library{
-      name:   "barLib",
+	name:   "barLib",
+	bazel_module: { bp2build_available: false },
 }
 `,
 		ExpectedBazelTargets: []string{
-			MakeBazelTarget("java_library", "barLib", AttrNameToString{}),
-			MakeNeverlinkDuplicateTarget("java_library", "barLib"),
 			MakeBazelTarget("android_library", "foo_kt", AttrNameToString{
 				"srcs":           `["a.java"]`,
 				"common_srcs":    `["b.kt"]`,
 				"manifest":       `"fooManifest.xml"`,
 				"resource_files": `["res/res.png"]`,
 				"deps":           `[":barLib-neverlink"]`,
+				"sdk_version":    `"current"`, // use as default
 			}),
 			MakeBazelTarget("android_binary", "foo", AttrNameToString{
 				"deps":             `[":foo_kt"]`,
 				"certificate_name": `"foocert"`,
 				"manifest":         `"fooManifest.xml"`,
+				"sdk_version":      `"current"`, // use as default
 			}),
 		}})
 }
@@ -328,11 +333,12 @@
 		},
 		Blueprint: simpleModuleDoNotConvertBp2build("filegroup", "foocert") + `
 android_app {
-        name: "foo",
-        srcs: ["a.java", "b.kt"],
-        certificate: ":foocert",
-        manifest: "fooManifest.xml",
-        kotlincflags: ["-flag1", "-flag2"],
+	name: "foo",
+	srcs: ["a.java", "b.kt"],
+	certificate: ":foocert",
+	manifest: "fooManifest.xml",
+	kotlincflags: ["-flag1", "-flag2"],
+	sdk_version: "current",
 }
 `,
 		ExpectedBazelTargets: []string{
@@ -347,11 +353,13 @@
         "-flag1",
         "-flag2",
     ]`,
+				"sdk_version": `"current"`, // use as default
 			}),
 			MakeBazelTarget("android_binary", "foo", AttrNameToString{
 				"deps":        `[":foo_kt"]`,
 				"certificate": `":foocert"`,
 				"manifest":    `"fooManifest.xml"`,
+				"sdk_version": `"current"`,
 			}),
 		}})
 }
@@ -364,11 +372,11 @@
 		Filesystem:                 map[string]string{},
 		Blueprint: simpleModuleDoNotConvertBp2build("filegroup", "foocert") + `
 android_app {
-        name: "foo",
-        sdk_version: "current",
-        min_sdk_version: "24",
-        max_sdk_version: "30",
-        target_sdk_version: "29",
+	name: "foo",
+	sdk_version: "current",
+	min_sdk_version: "24",
+	max_sdk_version: "30",
+	target_sdk_version: "29",
 }
 `,
 		ExpectedBazelTargets: []string{
@@ -393,8 +401,8 @@
 		Filesystem:                 map[string]string{},
 		Blueprint: simpleModuleDoNotConvertBp2build("filegroup", "foocert") + `
 android_app {
-        name: "foo",
-        sdk_version: "30",
+	name: "foo",
+	sdk_version: "30",
 }
 `,
 		ExpectedBazelTargets: []string{
diff --git a/bp2build/java_host_for_device_conversion_test.go b/bp2build/java_host_for_device_conversion_test.go
index 448cba4..1fa7126 100644
--- a/bp2build/java_host_for_device_conversion_test.go
+++ b/bp2build/java_host_for_device_conversion_test.go
@@ -48,6 +48,7 @@
     name: "java-lib-2",
     srcs: ["b.java"],
     bazel_module: { bp2build_available: true },
+    sdk_version: "current",
 }`,
 		ExpectedBazelTargets: []string{
 			MakeBazelTarget("java_host_for_device", "java-lib-1", AttrNameToString{
@@ -57,7 +58,8 @@
 				"sdk_version": `"none"`,
 			}),
 			MakeBazelTarget("java_library", "java-lib-2", AttrNameToString{
-				"srcs": `["b.java"]`,
+				"srcs":        `["b.java"]`,
+				"sdk_version": `"current"`,
 			}),
 			MakeNeverlinkDuplicateTarget("java_library", "java-lib-2"),
 		},
diff --git a/bp2build/java_library_conversion_test.go b/bp2build/java_library_conversion_test.go
index 5c769a5..7429ae6 100644
--- a/bp2build/java_library_conversion_test.go
+++ b/bp2build/java_library_conversion_test.go
@@ -42,22 +42,26 @@
     srcs: ["a.java", "b.java"],
     exclude_srcs: ["b.java"],
     libs: ["java-lib-2"],
+    sdk_version: "current",
     bazel_module: { bp2build_available: true },
 }
 
 java_library {
     name: "java-lib-2",
     srcs: ["b.java"],
+    sdk_version: "current",
     bazel_module: { bp2build_available: true },
 }`,
 		ExpectedBazelTargets: []string{
 			MakeBazelTarget("java_library", "java-lib-1", AttrNameToString{
-				"srcs": `["a.java"]`,
-				"deps": `[":java-lib-2-neverlink"]`,
+				"srcs":        `["a.java"]`,
+				"deps":        `[":java-lib-2-neverlink"]`,
+				"sdk_version": `"current"`,
 			}),
 			MakeNeverlinkDuplicateTarget("java_library", "java-lib-1"),
 			MakeBazelTarget("java_library", "java-lib-2", AttrNameToString{
-				"srcs": `["b.java"]`,
+				"srcs":        `["b.java"]`,
+				"sdk_version": `"current"`,
 			}),
 			MakeNeverlinkDuplicateTarget("java_library", "java-lib-2"),
 		},
@@ -71,18 +75,21 @@
     srcs: ["a.java"],
     libs: ["java-lib-2"],
     static_libs: ["java-lib-3"],
+    sdk_version: "current",
     bazel_module: { bp2build_available: true },
 }
 
 java_library {
     name: "java-lib-2",
     srcs: ["b.java"],
+    sdk_version: "current",
     bazel_module: { bp2build_available: false },
 }
 
 java_library {
     name: "java-lib-3",
     srcs: ["c.java"],
+    sdk_version: "current",
     bazel_module: { bp2build_available: false },
 }`,
 		ExpectedBazelTargets: []string{
@@ -92,7 +99,8 @@
         ":java-lib-2-neverlink",
         ":java-lib-3",
     ]`,
-				"exports": `[":java-lib-3"]`,
+				"exports":     `[":java-lib-3"]`,
+				"sdk_version": `"current"`,
 			}),
 			MakeNeverlinkDuplicateTarget("java_library", "java-lib-1"),
 		},
@@ -104,6 +112,7 @@
 		Blueprint: `java_library {
     name: "java-lib-1",
     static_libs: ["java-lib-2"],
+    sdk_version: "current",
     bazel_module: { bp2build_available: true },
 }
 
@@ -114,25 +123,40 @@
 }`,
 		ExpectedBazelTargets: []string{
 			MakeBazelTarget("java_library", "java-lib-1", AttrNameToString{
-				"exports": `[":java-lib-2"]`,
+				"exports":     `[":java-lib-2"]`,
+				"sdk_version": `"current"`,
 			}),
 			MakeNeverlinkDuplicateTarget("java_library", "java-lib-1"),
 		},
 	})
 }
 
+func TestJavaLibraryFailsToConvertNoSdkVersion(t *testing.T) {
+	runJavaLibraryTestCase(t, Bp2buildTestCase{
+		Blueprint: `
+java_library {
+    name: "lib",
+    bazel_module: { bp2build_available: true },
+}
+`,
+		ExpectedBazelTargets: []string{}, // no targets expected because sdk_version is not set
+	})
+}
+
 func TestJavaLibraryFailsToConvertLibsWithNoSrcs(t *testing.T) {
 	runJavaLibraryTestCase(t, Bp2buildTestCase{
 		ExpectedErr: fmt.Errorf("Module has direct dependencies but no sources. Bazel will not allow this."),
 		Blueprint: `java_library {
     name: "java-lib-1",
     libs: ["java-lib-2"],
+    sdk_version: "current",
     bazel_module: { bp2build_available: true },
 }
 
 java_library {
     name: "java-lib-2",
     srcs: ["a.java"],
+    sdk_version: "current",
     bazel_module: { bp2build_available: false },
 }`,
 		ExpectedBazelTargets: []string{},
@@ -144,6 +168,7 @@
 		Blueprint: `java_library {
     name: "java-lib-1",
     plugins: ["java-plugin-1"],
+    sdk_version: "current",
     bazel_module: { bp2build_available: true },
 }
 
@@ -154,7 +179,8 @@
 }`,
 		ExpectedBazelTargets: []string{
 			MakeBazelTarget("java_library", "java-lib-1", AttrNameToString{
-				"plugins": `[":java-plugin-1"]`,
+				"plugins":     `[":java-plugin-1"]`,
+				"sdk_version": `"current"`,
 			}),
 			MakeNeverlinkDuplicateTarget("java_library", "java-lib-1"),
 		},
@@ -169,16 +195,21 @@
     name: "java-lib-1",
     srcs: ["a.java"],
     java_version: "11",
+    sdk_version: "current",
 }`,
 		ExpectedBazelTargets: []string{
 			MakeBazelTarget("java_library", "java-lib-1", AttrNameToString{
 				"srcs":         `["a.java"]`,
 				"java_version": `"11"`,
+				"sdk_version":  `"current"`,
 			}),
 			MakeNeverlinkDuplicateTargetWithAttrs(
 				"java_library",
 				"java-lib-1",
-				AttrNameToString{"java_version": `"11"`}),
+				AttrNameToString{
+					"java_version": `"11"`,
+					"sdk_version":  `"current"`,
+				}),
 		},
 	})
 }
@@ -189,6 +220,7 @@
     name: "java-lib-1",
     srcs: ["a.java"],
     javacflags: ["-Xsuper-fast"],
+    sdk_version: "current",
     errorprone: {
         enabled: true,
         javacflags: ["-Xep:SpeedLimit:OFF"],
@@ -209,6 +241,7 @@
 				"plugins":                 `[":plugin2"]`,
 				"srcs":                    `["a.java"]`,
 				"errorprone_force_enable": `True`,
+				"sdk_version":             `"current"`,
 			}),
 			MakeNeverlinkDuplicateTarget("java_library", "java-lib-1"),
 		},
@@ -222,6 +255,7 @@
 		Blueprint: `java_library {
     name: "java-lib-1",
     srcs: ["a.java"],
+    sdk_version: "current",
     javacflags: ["-Xsuper-fast"],
     errorprone: {
         javacflags: ["-Xep:SpeedLimit:OFF"],
@@ -229,8 +263,9 @@
 }`,
 		ExpectedBazelTargets: []string{
 			MakeBazelTarget("java_library", "java-lib-1", AttrNameToString{
-				"javacopts": `["-Xsuper-fast"]`,
-				"srcs":      `["a.java"]`,
+				"javacopts":   `["-Xsuper-fast"]`,
+				"srcs":        `["a.java"]`,
+				"sdk_version": `"current"`,
 			}),
 			MakeNeverlinkDuplicateTarget("java_library", "java-lib-1"),
 		},
@@ -243,6 +278,7 @@
     name: "java-lib-1",
     srcs: ["a.java"],
     javacflags: ["-Xsuper-fast"],
+    sdk_version: "current",
     errorprone: {
     enabled: false,
     },
@@ -253,7 +289,8 @@
         "-Xsuper-fast",
         "-XepDisableAllChecks",
     ]`,
-				"srcs": `["a.java"]`,
+				"srcs":        `["a.java"]`,
+				"sdk_version": `"current"`,
 			}),
 			MakeNeverlinkDuplicateTarget("java_library", "java-lib-1"),
 		},
@@ -266,14 +303,15 @@
 		ModuleTypeUnderTest:        "java_library",
 		ModuleTypeUnderTestFactory: java.LibraryFactory,
 		Blueprint: `java_library {
-        name: "example_lib",
-        srcs: [
-			"a.java",
-			"b.java",
-			"a.logtag",
-			"b.logtag",
-		],
-        bazel_module: { bp2build_available: true },
+	name: "example_lib",
+	srcs: [
+		"a.java",
+		"b.java",
+		"a.logtag",
+		"b.logtag",
+	],
+	sdk_version: "current",
+	bazel_module: { bp2build_available: true },
 }`,
 		ExpectedBazelTargets: []string{
 			MakeBazelTarget("event_log_tags", "example_lib_logtags", AttrNameToString{
@@ -288,6 +326,7 @@
         "b.java",
         ":example_lib_logtags",
     ]`,
+				"sdk_version": `"current"`,
 			}),
 			MakeNeverlinkDuplicateTarget("java_library", "example_lib"),
 		}})
@@ -301,9 +340,10 @@
 			"adir/res/b.res":      "",
 			"adir/res/dir1/b.res": "",
 			"adir/Android.bp": `java_library {
-    name: "java-lib-1",
-    java_resources: ["res/a.res", "res/b.res"],
-    bazel_module: { bp2build_available: true },
+	name: "java-lib-1",
+	java_resources: ["res/a.res", "res/b.res"],
+	sdk_version: "current",
+	bazel_module: { bp2build_available: true },
 }`,
 		},
 		Blueprint: "",
@@ -314,6 +354,7 @@
         "res/b.res",
     ]`,
 				"resource_strip_prefix": `"adir"`,
+				"sdk_version":           `"current"`,
 			}),
 			MakeNeverlinkDuplicateTarget("java_library", "java-lib-1"),
 		},
@@ -328,8 +369,9 @@
 			"res/dir1/b.res": "",
 		},
 		Blueprint: `java_library {
-    name: "java-lib-1",
+	name: "java-lib-1",
 	java_resource_dirs: ["res"],
+	sdk_version: "current",
 }`,
 		ExpectedBazelTargets: []string{
 			MakeBazelTarget("java_library", "java-lib-1", AttrNameToString{
@@ -339,6 +381,7 @@
         "res/b.res",
         "res/dir1/b.res",
     ]`,
+				"sdk_version": `"current"`,
 			}),
 			MakeNeverlinkDuplicateTarget("java_library", "java-lib-1"),
 		},
@@ -352,14 +395,16 @@
 			"res/exclude/b.res": "",
 		},
 		Blueprint: `java_library {
-    name: "java-lib-1",
+	name: "java-lib-1",
 	java_resource_dirs: ["res"],
+	sdk_version: "current",
 	exclude_java_resource_dirs: ["res/exclude"],
 }`,
 		ExpectedBazelTargets: []string{
 			MakeBazelTarget("java_library", "java-lib-1", AttrNameToString{
 				"resource_strip_prefix": `"res"`,
 				"resources":             `["res/a.res"]`,
+				"sdk_version":           `"current"`,
 			}),
 			MakeNeverlinkDuplicateTarget("java_library", "java-lib-1"),
 		},
@@ -374,8 +419,9 @@
 			"res/dir1/exclude.res": "",
 		},
 		Blueprint: `java_library {
-    name: "java-lib-1",
+	name: "java-lib-1",
 	java_resource_dirs: ["res"],
+	sdk_version: "current",
 	exclude_java_resources: ["res/dir1/exclude.res"],
 }`,
 		ExpectedBazelTargets: []string{
@@ -385,6 +431,7 @@
         "res/a.res",
         "res/dir1/b.res",
     ]`,
+				"sdk_version": `"current"`,
 			}),
 			MakeNeverlinkDuplicateTarget("java_library", "java-lib-1"),
 		},
@@ -398,8 +445,9 @@
 			"res1/b.res": "",
 		},
 		Blueprint: `java_library {
-    name: "java-lib-1",
+	name: "java-lib-1",
 	java_resource_dirs: ["res", "res1"],
+	sdk_version: "current",
 }`,
 		ExpectedBazelTargets: []string{
 			MakeBazelTarget("java_resources", "java-lib-1_resource_dir_res1", AttrNameToString{
@@ -410,6 +458,7 @@
 				"additional_resources":  `["java-lib-1_resource_dir_res1"]`,
 				"resources":             `["res/a.res"]`,
 				"resource_strip_prefix": `"res"`,
+				"sdk_version":           `"current"`,
 			}),
 			MakeNeverlinkDuplicateTarget("java_library", "java-lib-1"),
 		},
@@ -422,9 +471,10 @@
 			"resdir/a.res": "",
 		},
 		Blueprint: `java_library {
-    name: "java-lib-1",
-    java_resources: ["res1", "res2"],
-    java_resource_dirs: ["resdir"],
+		name: "java-lib-1",
+		java_resources: ["res1", "res2"],
+		java_resource_dirs: ["resdir"],
+		sdk_version: "current",
 }`,
 		ExpectedBazelTargets: []string{
 			MakeBazelTarget("java_resources", "java-lib-1_resource_dir_resdir", AttrNameToString{
@@ -438,6 +488,7 @@
         "res1",
         "res2",
     ]`,
+				"sdk_version": `"current"`,
 			}),
 			MakeNeverlinkDuplicateTarget("java_library", "java-lib-1"),
 		},
@@ -450,14 +501,15 @@
 		ModuleTypeUnderTest:        "java_library",
 		ModuleTypeUnderTestFactory: java.LibraryFactory,
 		Blueprint: `java_library {
-        name: "example_lib",
-        srcs: [
-			"a.java",
-			"b.java",
-			"a.aidl",
-			"b.aidl",
-		],
-        bazel_module: { bp2build_available: true },
+	name: "example_lib",
+	srcs: [
+		"a.java",
+		"b.java",
+		"a.aidl",
+		"b.aidl",
+	],
+	bazel_module: { bp2build_available: true },
+	sdk_version: "current",
 }`,
 		ExpectedBazelTargets: []string{
 			MakeBazelTarget("aidl_library", "example_lib_aidl_library", AttrNameToString{
@@ -476,6 +528,7 @@
         "a.java",
         "b.java",
     ]`,
+				"sdk_version": `"current"`,
 			}),
 			MakeNeverlinkDuplicateTarget("java_library", "example_lib"),
 		}})
@@ -488,12 +541,13 @@
 		ModuleTypeUnderTestFactory: java.LibraryFactory,
 		Blueprint: `
 java_library {
-        name: "example_lib",
-        srcs: [
-			"a.java",
-			"b.aidl",
-		],
-        bazel_module: { bp2build_available: true },
+	name: "example_lib",
+	srcs: [
+		"a.java",
+		"b.aidl",
+	],
+	sdk_version: "current",
+	bazel_module: { bp2build_available: true },
 }`,
 		ExpectedBazelTargets: []string{
 			MakeBazelTarget("aidl_library", "example_lib_aidl_library", AttrNameToString{
@@ -503,9 +557,10 @@
 				"deps": `[":example_lib_aidl_library"]`,
 			}),
 			MakeBazelTarget("java_library", "example_lib", AttrNameToString{
-				"deps":    `[":example_lib_java_aidl_library"]`,
-				"exports": `[":example_lib_java_aidl_library"]`,
-				"srcs":    `["a.java"]`,
+				"deps":        `[":example_lib_java_aidl_library"]`,
+				"exports":     `[":example_lib_java_aidl_library"]`,
+				"srcs":        `["a.java"]`,
+				"sdk_version": `"current"`,
 			}),
 			MakeNeverlinkDuplicateTarget("java_library", "example_lib"),
 		},
@@ -535,14 +590,15 @@
 	],
 }
 java_library {
-        name: "example_lib",
-        srcs: [
-			"a.java",
-			"b.java",
-			":aidl_files",
-			":random_other_files",
-		],
-        bazel_module: { bp2build_available: true },
+	name: "example_lib",
+	srcs: [
+		"a.java",
+		"b.java",
+		":aidl_files",
+		":random_other_files",
+	],
+	sdk_version: "current",
+	bazel_module: { bp2build_available: true },
 }`,
 		ExpectedBazelTargets: []string{
 			MakeBazelTargetNoRestrictions("aidl_library", "aidl_files", AttrNameToString{
@@ -563,6 +619,7 @@
         "b.java",
         ":random_other_files",
     ]`,
+				"sdk_version": `"current"`,
 			}),
 			MakeNeverlinkDuplicateTarget("java_library", "example_lib"),
 			MakeBazelTargetNoRestrictions("filegroup", "random_other_files", AttrNameToString{
@@ -585,24 +642,26 @@
 		Filesystem: map[string]string{
 			"path/to/A/Android.bp": `
 filegroup {
-	name: "A_aidl",
-	srcs: ["aidl/A.aidl"],
-	path: "aidl",
+  name: "A_aidl",
+  srcs: ["aidl/A.aidl"],
+  path: "aidl",
 }`,
 		},
 		Blueprint: `
 java_library {
-	name: "foo",
-	srcs: [
-		":A_aidl",
-	],
+  name: "foo",
+  srcs: [
+    ":A_aidl",
+  ],
+  sdk_version: "current",
 }`,
 		ExpectedBazelTargets: []string{
 			MakeBazelTarget("java_aidl_library", "foo_java_aidl_library", AttrNameToString{
 				"deps": `["//path/to/A:A_aidl"]`,
 			}),
 			MakeBazelTarget("java_library", "foo", AttrNameToString{
-				"exports": `[":foo_java_aidl_library"]`,
+				"exports":     `[":foo_java_aidl_library"]`,
+				"sdk_version": `"current"`,
 			}),
 			MakeNeverlinkDuplicateTarget("java_library", "foo"),
 		},
@@ -619,16 +678,17 @@
 		ModuleTypeUnderTestFactory: java.AndroidLibraryFactory,
 		Blueprint: simpleModuleDoNotConvertBp2build("android_library", "static_lib_dep") + `
 android_library {
-	name: "TestLib",
-	manifest: "manifest/AndroidManifest.xml",
-	srcs: ["lib.java"],
-	arch: {
-		arm: {
-			neon: {
-				srcs: ["arm_neon.java"],
-			},
-		},
-	},
+  name: "TestLib",
+  manifest: "manifest/AndroidManifest.xml",
+  srcs: ["lib.java"],
+  sdk_version: "current",
+  arch: {
+    arm: {
+      neon: {
+        srcs: ["arm_neon.java"],
+      },
+    },
+  },
 }
 `,
 		ExpectedBazelTargets: []string{
@@ -642,6 +702,7 @@
     })`,
 					"manifest":       `"manifest/AndroidManifest.xml"`,
 					"resource_files": `[]`,
+					"sdk_version":    `"current"`, // use as default
 				}),
 			MakeNeverlinkDuplicateTarget("android_library", "TestLib"),
 		}})
@@ -655,19 +716,20 @@
 		ModuleTypeUnderTestFactory: java.AndroidLibraryFactory,
 		Blueprint: simpleModuleDoNotConvertBp2build("android_library", "static_lib_dep") + `
 android_library {
-	name: "TestLib",
-	manifest: "manifest/AndroidManifest.xml",
-	srcs: ["lib.java"],
-	arch: {
-		x86: {
-			ssse3: {
-				srcs: ["ssse3.java"],
-			},
-			sse4_1: {
-				srcs: ["sse4_1.java"],
-			},
-		},
-	},
+  name: "TestLib",
+  manifest: "manifest/AndroidManifest.xml",
+  srcs: ["lib.java"],
+  sdk_version: "current",
+  arch: {
+    x86: {
+      ssse3: {
+        srcs: ["ssse3.java"],
+      },
+      sse4_1: {
+        srcs: ["sse4_1.java"],
+      },
+    },
+  },
 }
 `,
 		ExpectedBazelTargets: []string{
@@ -686,6 +748,7 @@
     })`,
 					"manifest":       `"manifest/AndroidManifest.xml"`,
 					"resource_files": `[]`,
+					"sdk_version":    `"current"`,
 				}),
 			MakeNeverlinkDuplicateTarget("android_library", "TestLib"),
 		}})
@@ -699,17 +762,18 @@
 		ModuleTypeUnderTestFactory: java.AndroidLibraryFactory,
 		Blueprint: simpleModuleDoNotConvertBp2build("android_library", "static_lib_dep") + `
 android_library {
-	name: "TestLib",
-	manifest: "manifest/AndroidManifest.xml",
-	srcs: ["lib.java"],
-	arch: {
-		arm: {
-			srcs: ["arm_non_neon.java"],
-			neon: {
-				exclude_srcs: ["arm_non_neon.java"],
-			},
-		},
-	},
+  name: "TestLib",
+  manifest: "manifest/AndroidManifest.xml",
+  srcs: ["lib.java"],
+  arch: {
+    arm: {
+      srcs: ["arm_non_neon.java"],
+      neon: {
+        exclude_srcs: ["arm_non_neon.java"],
+      },
+    },
+  },
+  sdk_version: "current",
 }
 `,
 		ExpectedBazelTargets: []string{
@@ -724,6 +788,7 @@
     })`,
 					"manifest":       `"manifest/AndroidManifest.xml"`,
 					"resource_files": `[]`,
+					"sdk_version":    `"current"`, // use as default
 				}),
 			MakeNeverlinkDuplicateTarget("android_library", "TestLib"),
 		}})
@@ -736,6 +801,7 @@
     name: "java-lib-1",
     srcs: ["a.java", "b.java", "c.kt"],
     bazel_module: { bp2build_available: true },
+    sdk_version: "current",
 }
 `,
 		ExpectedBazelTargets: []string{
@@ -745,6 +811,7 @@
         "b.java",
         "c.kt",
     ]`,
+				"sdk_version": `"current"`,
 			}),
 			MakeNeverlinkDuplicateTarget("kt_jvm_library", "java-lib-1"),
 		},
@@ -759,6 +826,7 @@
     srcs: [ "a.kt"],
     kotlincflags: ["-flag1", "-flag2"],
     bazel_module: { bp2build_available: true },
+    sdk_version: "current",
 }
 `,
 		ExpectedBazelTargets: []string{
@@ -768,6 +836,7 @@
         "-flag1",
         "-flag2",
     ]`,
+				"sdk_version": `"current"`,
 			}),
 			MakeNeverlinkDuplicateTarget("kt_jvm_library", "java-lib-1"),
 		},
@@ -782,6 +851,7 @@
     srcs: ["a.java", "b.java"],
     common_srcs: ["c.kt"],
     bazel_module: { bp2build_available: true },
+    sdk_version: "current",
 }
 `,
 		ExpectedBazelTargets: []string{
@@ -791,6 +861,7 @@
         "b.java",
     ]`,
 				"common_srcs": `["c.kt"]`,
+				"sdk_version": `"current"`,
 			}),
 			MakeNeverlinkDuplicateTarget("kt_jvm_library", "java-lib-1"),
 		},
@@ -804,6 +875,7 @@
     name: "java-lib-1",
     srcs: ["a.java"],
     libs: ["java-lib-2"],
+    sdk_version: "current",
     target: {
         android: {
             libs: ["java-lib-3"],
@@ -813,16 +885,19 @@
     bazel_module: { bp2build_available: true },
 }
 
-	java_library{
-		name: "java-lib-2",
+  java_library{
+    name: "java-lib-2",
+    bazel_module: { bp2build_available: false },
 }
 
-	java_library{
-		name: "java-lib-3",
+  java_library{
+    name: "java-lib-3",
+    bazel_module: { bp2build_available: false },
 }
 
-	java_library{
-		name: "java-lib-4",
+  java_library{
+    name: "java-lib-4",
+    bazel_module: { bp2build_available: false },
 }
 `,
 		ExpectedBazelTargets: []string{
@@ -839,14 +914,9 @@
         ],
         "//conditions:default": [],
     })`,
+				"sdk_version": `"current"`,
 			}),
 			MakeNeverlinkDuplicateTarget("java_library", "java-lib-1"),
-			MakeBazelTarget("java_library", "java-lib-2", AttrNameToString{}),
-			MakeNeverlinkDuplicateTarget("java_library", "java-lib-2"),
-			MakeBazelTarget("java_library", "java-lib-3", AttrNameToString{}),
-			MakeNeverlinkDuplicateTarget("java_library", "java-lib-3"),
-			MakeBazelTarget("java_library", "java-lib-4", AttrNameToString{}),
-			MakeNeverlinkDuplicateTarget("java_library", "java-lib-4"),
 		},
 	})
 }
@@ -857,6 +927,7 @@
 		Blueprint: `java_library {
     name: "java-lib-1",
     srcs: ["a.java", "b.java"],
+    sdk_version: "current",
     target: {
         android: {
             exclude_srcs: ["a.java"],
@@ -871,6 +942,7 @@
         "//build/bazel/platforms/os:android": [],
         "//conditions:default": ["a.java"],
     })`,
+				"sdk_version": `"current"`,
 			}),
 			MakeNeverlinkDuplicateTarget("java_library", "java-lib-1"),
 		},
@@ -888,6 +960,7 @@
 		Blueprint: `java_library {
     name: "java-lib-1",
     srcs: ["a.java"],
+    sdk_version: "current",
     java_resources: [":filegroup1"],
     bazel_module: { bp2build_available: true },
 }
@@ -904,6 +977,7 @@
 				"srcs":                  `["a.java"]`,
 				"resources":             `[":filegroup1"]`,
 				"resource_strip_prefix": `"foo"`,
+				"sdk_version":           `"current"`,
 			}),
 			MakeNeverlinkDuplicateTarget("java_library", "java-lib-1"),
 			MakeBazelTargetNoRestrictions("filegroup", "filegroup1", AttrNameToString{
@@ -927,6 +1001,7 @@
     name: "java-lib-1",
     srcs: ["a.java"],
     java_resources: ["a.res", ":filegroup1", ":filegroup2"],
+    sdk_version: "current",
     bazel_module: { bp2build_available: true },
 }
 
@@ -959,6 +1034,7 @@
         "java-lib-1_filegroup_resources_filegroup1",
         "java-lib-1_filegroup_resources_filegroup2",
     ]`,
+				"sdk_version": `"current"`,
 			}),
 			MakeNeverlinkDuplicateTarget("java_library", "java-lib-1"),
 			MakeBazelTargetNoRestrictions("filegroup", "filegroup1", AttrNameToString{
diff --git a/bp2build/java_proto_conversion_test.go b/bp2build/java_proto_conversion_test.go
index f546cf4..5d6b088 100644
--- a/bp2build/java_proto_conversion_test.go
+++ b/bp2build/java_proto_conversion_test.go
@@ -68,6 +68,7 @@
         type: "%s",
     },
     srcs: ["a.proto"],
+    sdk_version: "current",
 }`
 
 	protoLibrary := MakeBazelTarget("proto_library", "java-protos_proto", AttrNameToString{
@@ -86,10 +87,12 @@
 					tc.javaLibraryType,
 					javaLibraryName,
 					AttrNameToString{
-						"deps": `[":java-protos_proto"]`,
+						"deps":        `[":java-protos_proto"]`,
+						"sdk_version": `"current"`,
 					}),
 				MakeBazelTarget("java_library", "java-protos", AttrNameToString{
-					"exports": fmt.Sprintf(`[":%s"]`, javaLibraryName),
+					"exports":     fmt.Sprintf(`[":%s"]`, javaLibraryName),
+					"sdk_version": `"current"`,
 				}),
 				MakeNeverlinkDuplicateTarget("java_library", "java-protos"),
 			},
@@ -104,6 +107,7 @@
     name: "java-protos",
     srcs: ["a.proto"],
     java_version: "7",
+    sdk_version: "current",
 }
 `,
 		ExpectedBazelTargets: []string{
@@ -116,15 +120,20 @@
 				AttrNameToString{
 					"deps":         `[":java-protos_proto"]`,
 					"java_version": `"7"`,
+					"sdk_version":  `"current"`,
 				}),
 			MakeBazelTarget("java_library", "java-protos", AttrNameToString{
 				"exports":      `[":java-protos_java_proto_lite"]`,
 				"java_version": `"7"`,
+				"sdk_version":  `"current"`,
 			}),
 			MakeNeverlinkDuplicateTargetWithAttrs(
 				"java_library",
 				"java-protos",
-				AttrNameToString{"java_version": `"7"`}),
+				AttrNameToString{
+					"java_version": `"7"`,
+					"sdk_version":  `"current"`,
+				}),
 		},
 	})
 }
diff --git a/bp2build/testing.go b/bp2build/testing.go
index 18ae82d..42d955e 100644
--- a/bp2build/testing.go
+++ b/bp2build/testing.go
@@ -688,7 +688,9 @@
 }
 
 func MakeNeverlinkDuplicateTarget(moduleType string, name string) string {
-	return MakeNeverlinkDuplicateTargetWithAttrs(moduleType, name, AttrNameToString{})
+	return MakeNeverlinkDuplicateTargetWithAttrs(moduleType, name, AttrNameToString{
+		"sdk_version": `"current"`, // use as default
+	})
 }
 
 func MakeNeverlinkDuplicateTargetWithAttrs(moduleType string, name string, extraAttrs AttrNameToString) string {
diff --git a/java/java.go b/java/java.go
index 4b01c31..6c448a2 100644
--- a/java/java.go
+++ b/java/java.go
@@ -2905,6 +2905,11 @@
 	var deps bazel.LabelListAttribute
 	var staticDeps bazel.LabelListAttribute
 
+	if proptools.String(m.deviceProperties.Sdk_version) == "" && m.DeviceSupported() {
+		ctx.MarkBp2buildUnconvertible(bp2build_metrics_proto.UnconvertedReasonType_PROPERTY_UNSUPPORTED, "sdk_version unset")
+		return &javaCommonAttributes{}, &bp2BuildJavaInfo{}, false
+	}
+
 	archVariantProps := m.GetArchVariantProperties(ctx, &CommonProperties{})
 	for axis, configToProps := range archVariantProps {
 		for config, _props := range configToProps {