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
label= PreferencesMessages.getString("CompilerConfigurationBlock.pb_missing_javadoc_tags_overriding.label"); 
		addCheckBox(composite, label, PREF_PB_MISSING_JAVADOC_TAGS_OVERRIDING, enabledDisabled, indent);
		separator= new Label(composite, SWT.HORIZONTAL);
		gd= new GridData(GridData.HORIZONTAL_ALIGN_FILL);
		gd.horizontalSpan= nColumns;
		separator.setLayoutData(gd);
		
		label = PreferencesMessages.getString("CompilerConfigurationBlock.pb_missing_comments.label"); 
		addComboBox(composite, label, PREF_PB_MISSING_JAVADOC_COMMENTS, errorWarningIgnore, errorWarningIgnoreLabels, 0);
		label = PreferencesMessages.getString("CompilerConfigurationBlock.pb_missing_comments_visibility.label"); 
		addComboBox(composite, label, PREF_PB_MISSING_JAVADOC_COMMENTS_VISIBILITY, visibilities, visibilitiesLabels, indent);
		
		label= PreferencesMessages.getString("CompilerConfigurationBlock.pb_missing_comments_overriding.label"); 
		addCheckBox(composite, label, PREF_PB_MISSING_JAVADOC_COMMENTS_OVERRIDING, enabledDisabled, indent);
		return outer;
	}
	
	private Composite createBuildPathTabContent(TabFolder folder) {
		String[] abortIgnoreValues= new String[] { ABORT, IGNORE };
		String[] cleanIgnoreValues= new String[] { CLEAN, IGNORE };
		String[] enableDisableValues= new String[] { ENABLED, DISABLED };
		
		String[] errorWarning= new String[] { ERROR, WARNING };
		
		String[] errorWarningLabels= new String[] {
			PreferencesMessages.getString("CompilerConfigurationBlock.error"),  
			PreferencesMessages.getString("CompilerConfigurationBlock.warning") 
		};
		
		int nColumns= 3;