Patch SourceTypeConverter to avoid parsing empty strings

src/eclipseAgent/lombok/eclipse/agent/EclipsePatcher.java

@@ -875,6 +875,14 @@ private static void patchFixSourceTypeConverter(ScriptManager sm) {
 				.target(new MethodTarget(SOURCE_TYPE_CONVERTER_SIG, "convertAnnotations", ANNOTATION_SIG + "[]", I_ANNOTATABLE_SIG))
 				.wrapMethod(new Hook("lombok.launch.PatchFixesHider$PatchFixes", "convertAnnotations", ANNOTATION_SIG + "[]", ANNOTATION_SIG + "[]", I_ANNOTATABLE_SIG))
 				.request(StackRequest.PARAM1, StackRequest.RETURN_VALUE).build());
+
+		sm.addScriptIfWitness(OSGI_TYPES, ScriptBuilder.exitEarly()
+				.target(new MethodTarget(SOURCE_TYPE_CONVERTER_SIG, "parseMemberValue", "org.eclipse.jdt.internal.compiler.ast.Expression", "char[]"))
+				.decisionMethod(new Hook("lombok.launch.PatchFixesHider$PatchFixes", "isEmpty", "boolean", "char[]"))
+				.valueMethod(new Hook("lombok.launch.PatchFixesHider$PatchFixes", "returnNullExpression", "org.eclipse.jdt.internal.compiler.ast.Expression", "java.lang.Object"))
+				.request(StackRequest.PARAM1)
+				.transplant()
+				.build());
 	}
 
 	private static void patchEclipseDebugPatches(ScriptManager sm) {

src/eclipseAgent/lombok/launch/PatchFixesHider.java

@@ -892,6 +892,14 @@ public static Annotation[] convertAnnotations(Annotation[] out, IAnnotatable ann
 			return replace;
 		}
 
+		public static boolean isEmpty(char[] array) {
+			return array.length == 0;
+		}
+
+		public static Expression returnNullExpression(Object string) {
+			return null;
+		}
+
 		public static String getRealNodeSource(String original, org.eclipse.jdt.internal.compiler.ast.ASTNode node) {
 			if (!isGenerated(node)) return original;
 

test/eclipse/resource/noerrors/synchronizedUsage/ClassWithSynchronized.java

@@ -0,0 +1,9 @@
+package pkg;
+
+import lombok.Synchronized;
+
+public class ClassWithSynchronized {
+	@Synchronized
+	public void test() {
+	}
+}

test/eclipse/resource/noerrors/synchronizedUsage/Usage.java

@@ -0,0 +1,10 @@
+package pkg;
+
+public class Usage {
+	private ClassWithSynchronized test;
+
+	// Prevent "The value of the field Usage.test is not used"
+	public void test() {
+		test.test();
+	}
+}

test/eclipse/src/lombok/eclipse/compile/NoErrorsTest.java

@@ -21,9 +21,10 @@
  */
 package lombok.eclipse.compile;
 
-import static org.junit.Assert.assertTrue;
+import static org.junit.Assert.*;
 
 import java.util.ArrayList;
+import java.util.Collections;
 import java.util.List;
 
 import org.eclipse.jdt.core.ICompilationUnit;
@@ -49,15 +50,23 @@ public void fieldNameConstantsInAnnotation() throws Exception {
 		ICompilationUnit cu = setup.getPackageFragment().getCompilationUnit("Usage.java");
 
 		List<IProblem> problems = collectProblems(cu);
-		assertTrue(problems.isEmpty());
+		assertEquals(Collections.emptyList(), problems);
 	}
 
 	@Test
 	public void builderJavadoc() throws Exception {
 		ICompilationUnit cu = setup.getPackageFragment().getCompilationUnit("Usage.java");
 
 		List<IProblem> problems = collectProblems(cu);
-		assertTrue(problems.isEmpty());
+		assertEquals(Collections.emptyList(), problems);
+	}
+
+	@Test
+	public void synchronizedUsage() throws Exception {
+		ICompilationUnit cu = setup.getPackageFragment().getCompilationUnit("Usage.java");
+
+		List<IProblem> problems = collectProblems(cu);
+		assertEquals(Collections.emptyList(), problems);
 	}
 
 	private List<IProblem> collectProblems(ICompilationUnit cu) throws JavaModelException {