[fixes #3529] Set real field initializer source

Eclipse copies the field initializer source code if it is a constant.
For generated nodes we have to read it from the ast node and not from
the source file.

test/eclipse/resource/noerrors/fieldNameConstantsInAnnotation/Annotation.java

@@ -0,0 +1,5 @@
+package pkg;
+
+public @interface Annotation {
+	String value();
+}

test/eclipse/resource/noerrors/fieldNameConstantsInAnnotation/Constants.java

@@ -0,0 +1,8 @@
+package pkg;
+
+import lombok.experimental.FieldNameConstants;
+
+@FieldNameConstants
+public class Constants {
+	String test;
+}

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

@@ -0,0 +1,5 @@
+package pkg;
+
+@Annotation(Constants.Fields.test)
+public class Usage {
+}

test/eclipse/src/lombok/eclipse/EclipseTests.java

@@ -5,6 +5,7 @@ import org.junit.runners.Suite;
 import org.junit.runners.Suite.SuiteClasses;
 
 import lombok.eclipse.cleanup.CleanupTest;
+import lombok.eclipse.compile.NoErrorsTest;
 import lombok.eclipse.edit.SelectTest;
 import lombok.eclipse.refactoring.ExtractInterfaceTest;
 import lombok.eclipse.refactoring.InlineTest;
@@ -12,7 +13,7 @@ import lombok.eclipse.refactoring.RenameTest;
 import lombok.eclipse.references.FindReferencesTest;
 
 @RunWith(Suite.class)
-@SuiteClasses({ExtractInterfaceTest.class, RenameTest.class, SelectTest.class, CleanupTest.class, FindReferencesTest.class, InlineTest.class})
+@SuiteClasses({ExtractInterfaceTest.class, RenameTest.class, SelectTest.class, CleanupTest.class, FindReferencesTest.class, InlineTest.class, NoErrorsTest.class})
 public class EclipseTests {
 	
 }

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

@@ -0,0 +1,68 @@
+package lombok.eclipse.compile;
+
+import static org.junit.Assert.assertTrue;
+
+import java.util.ArrayList;
+import java.util.List;
+
+import org.eclipse.jdt.core.ICompilationUnit;
+import org.eclipse.jdt.core.IProblemRequestor;
+import org.eclipse.jdt.core.WorkingCopyOwner;
+import org.eclipse.jdt.core.compiler.IProblem;
+import org.junit.Rule;
+import org.junit.Test;
+import org.junit.runner.RunWith;
+
+import lombok.eclipse.EclipseRunner;
+import lombok.eclipse.SetupSingleFileTest;
+
+@RunWith(EclipseRunner.class)
+public class NoErrorsTest {
+	
+	@Rule
+	public SetupSingleFileTest setup = new SetupSingleFileTest();
+	
+	@Test
+	public void fieldNameConstantsInAnnotation() throws Exception {
+		ICompilationUnit cu = setup.getPackageFragment().getCompilationUnit("Usage.java");
+		
+		final List<IProblem> problems = new ArrayList<IProblem>();
+		final IProblemRequestor requestor = new IProblemRequestor() {
+			@Override
+			public void acceptProblem(IProblem problem) {
+				problems.add(problem);
+			}
+			
+			@Override
+			public void beginReporting() {
+				problems.clear();
+			}
+			
+			@Override
+			public void endReporting() {
+			}
+			
+			@Override
+			public boolean isActive() {
+				return true;
+			}
+		};
+		
+		WorkingCopyOwner workingCopyOwner = new WorkingCopyOwner() {
+			@Override
+			public IProblemRequestor getProblemRequestor(ICompilationUnit workingCopy) {
+				return requestor;
+			}
+		};
+		
+		ICompilationUnit workingCopy = cu.getWorkingCopy(workingCopyOwner, null);
+		try {
+			workingCopy.reconcile(ICompilationUnit.NO_AST, true, true, workingCopy.getOwner(), null);
+		} finally {
+			workingCopy.discardWorkingCopy();
+		}
+		
+		System.out.println(problems);
+		assertTrue(problems.isEmpty());
+	}
+}