Bug 70284 [1.5] class file with "1.4 compatibility" cannot be run in Java 1.4
If I compile a simple class in Eclipse with the following compliance settings, it won't run in a 1.4 JVM. It appears the .class file relies on 1.5 libraries, despite the compatibility setting. Compiler compliance: 1.5 Generated .class compatibility: 1.4 Source compatibility: 1.5 Here's my source code: public class TestConcat { public static void main(String[] args) { String w = "world"; System.out.println("Hello " + w); } } The resulting exception: Exception in thread "main" java.lang.NoClassDefFoundError: java/lang/StringBuilder at TestConcat.main(TestConcat.java:13)
org.eclipse.jdt.ui/ui/org/eclipse/jdt/internal/ui/preferences/CompilerConfigurationBlock.java
&& IGNORE.equals(map.get(PREF_PB_ASSERT_AS_IDENTIFIER))
				&& VERSION_1_3.equals(map.get(PREF_SOURCE_COMPATIBILITY))
				&& VERSION_1_1.equals(map.get(PREF_CODEGEN_TARGET_PLATFORM)))
			|| (VERSION_1_4.equals(complianceLevel)
				&& WARNING.equals(map.get(PREF_PB_ASSERT_AS_IDENTIFIER))
				&& VERSION_1_3.equals(map.get(PREF_SOURCE_COMPATIBILITY))
				&& VERSION_1_2.equals(map.get(PREF_CODEGEN_TARGET_PLATFORM)))
			|| (VERSION_1_5.equals(complianceLevel)
				&& ERROR.equals(map.get(PREF_PB_ASSERT_AS_IDENTIFIER))
				&& VERSION_1_5.equals(map.get(PREF_SOURCE_COMPATIBILITY))
				&& VERSION_1_5.equals(map.get(PREF_CODEGEN_TARGET_PLATFORM)))) {
			return DEFAULT_CONF;
		}
		return USER_CONF;
	}
	
	
	protected String[] getFullBuildDialogStrings(boolean workspaceSettings) {
		String title= PreferencesMessages.getString("CompilerConfigurationBlock.needsbuild.title"); 
		String message;
		if (workspaceSettings) {
			message= PreferencesMessages.getString("CompilerConfigurationBlock.needsfullbuild.message"); 
		} else {
			message= PreferencesMessages.getString("CompilerConfigurationBlock.needsprojectbuild.message"); 
		}
		return new String[] { title, message };
	}	
	
}