diff --git a/java/base.go b/java/base.go
index f7989b8..440b004 100644
--- a/java/base.go
+++ b/java/base.go
@@ -1778,3 +1778,9 @@
 func (j *Module) ProvidesUsesLib() *string {
 	return j.usesLibraryProperties.Provides_uses_lib
 }
+
+type ModuleWithStem interface {
+	Stem() string
+}
+
+var _ ModuleWithStem = (*Module)(nil)
diff --git a/java/bootclasspath_fragment.go b/java/bootclasspath_fragment.go
index 188d362..44803a9 100644
--- a/java/bootclasspath_fragment.go
+++ b/java/bootclasspath_fragment.go
@@ -496,10 +496,21 @@
 
 	global := dexpreopt.GetGlobalConfig(ctx)
 
+	// Convert content names to their appropriate stems, in case a test library is overriding an actual boot jar
+	var stems []string
+	for _, name := range b.properties.Contents {
+		dep := ctx.GetDirectDepWithTag(name, bootclasspathFragmentContentDepTag)
+		if m, ok := dep.(ModuleWithStem); ok {
+			stems = append(stems, m.Stem())
+		} else {
+			ctx.PropertyErrorf("contents", "%v is not a ModuleWithStem", name)
+		}
+	}
+
 	// Only create configs for updatable boot jars. Non-updatable boot jars must be part of the
 	// platform_bootclasspath's classpath proto config to guarantee that they come before any
 	// updatable jars at runtime.
-	return global.UpdatableBootJars.Filter(b.properties.Contents)
+	return global.UpdatableBootJars.Filter(stems)
 }
 
 func (b *BootclasspathFragmentModule) getImageConfig(ctx android.EarlyModuleContext) *bootImageConfig {
diff --git a/java/systemserver_classpath_fragment.go b/java/systemserver_classpath_fragment.go
index 9111c30..f973cf4 100644
--- a/java/systemserver_classpath_fragment.go
+++ b/java/systemserver_classpath_fragment.go
@@ -97,10 +97,21 @@
 func (s *SystemServerClasspathModule) ClasspathFragmentToConfiguredJarList(ctx android.ModuleContext) android.ConfiguredJarList {
 	global := dexpreopt.GetGlobalConfig(ctx)
 
+	// Convert content names to their appropriate stems, in case a test library is overriding an actual boot jar
+	var stems []string
+	for _, name := range s.properties.Contents {
+		dep := ctx.GetDirectDepWithTag(name, systemServerClasspathFragmentContentDepTag)
+		if m, ok := dep.(ModuleWithStem); ok {
+			stems = append(stems, m.Stem())
+		} else {
+			ctx.PropertyErrorf("contents", "%v is not a ModuleWithStem", name)
+		}
+	}
+
 	// Only create configs for updatable boot jars. Non-updatable system server jars must be part of the
 	// platform_systemserverclasspath's classpath proto config to guarantee that they come before any
 	// updatable jars at runtime.
-	return global.UpdatableSystemServerJars.Filter(s.properties.Contents)
+	return global.UpdatableSystemServerJars.Filter(stems)
 }
 
 type systemServerClasspathFragmentContentDependencyTag struct {