Whoops, Classload errors running lombok on javac with backing JVM 7 or below; fixed.

src/core/lombok/javac/handlers/JavacHandlerUtil.java

@@ -1323,51 +1323,61 @@ public class JavacHandlerUtil {
 	 * 
 	 * in 'SETTER' mode, stripping works similarly to 'GETTER' mode, except {@code param} are copied and stripped from the original and {@code @return} are skipped.
 	 */
-	@SuppressWarnings("unchecked")
 	public static void copyJavadoc(JavacNode from, JCTree to, CopyJavadoc copyMode) {
 		if (copyMode == null) copyMode = CopyJavadoc.VERBATIM;
 		try {
 			JCCompilationUnit cu = ((JCCompilationUnit) from.top().get());
 			Object dc = Javac.getDocComments(cu);
 			if (dc instanceof Map) {
-				Map<JCTree, String> docComments = (Map<JCTree, String>) dc;
-				String javadoc = docComments.get(from.get());
-				
-				if (javadoc != null) {
-					String[] filtered = copyMode.split(javadoc);
-					docComments.put(to, filtered[0]);
-					docComments.put(from.get(), filtered[1]);
-				}
-			} else if (dc instanceof DocCommentTable) {
-				DocCommentTable dct = (DocCommentTable) dc;
-				Comment javadoc = dct.getComment(from.get());
-				
-				if (javadoc != null) {
-					String[] filtered = copyMode.split(javadoc.getText());
-					dct.putComment(to, createJavadocComment(filtered[0], from));
-					dct.putComment(from.get(), createJavadocComment(filtered[1], from));
-				}
+				copyJavadoc_jdk6_7(from, to, copyMode, dc);
+			} else if (Javac.instanceOfDocCommentTable(dc)) {
+				CopyJavadoc_8.copyJavadoc(from, to, copyMode, dc);
 			}
 		} catch (Exception ignore) {}
 	}
 	
-	private static Comment createJavadocComment(final String text, final JavacNode field) {
-		return new Comment() {
-			@Override public String getText() {
-				return text;
-			}
+	private static class CopyJavadoc_8 {
+		static void copyJavadoc(JavacNode from, JCTree to, CopyJavadoc copyMode, Object dc) {
+			DocCommentTable dct = (DocCommentTable) dc;
+			Comment javadoc = dct.getComment(from.get());
 			
-			@Override public int getSourcePos(int index) {
-				return -1;
+			if (javadoc != null) {
+				String[] filtered = copyMode.split(javadoc.getText());
+				dct.putComment(to, createJavadocComment(filtered[0], from));
+				dct.putComment(from.get(), createJavadocComment(filtered[1], from));
 			}
-			
-			@Override public CommentStyle getStyle() {
-				return CommentStyle.JAVADOC;
-			}
-			
-			@Override public boolean isDeprecated() {
-				return text.contains("@deprecated") && field.getKind() == Kind.FIELD && isFieldDeprecated(field);
-			}
-		};
+		}
+		
+		private static Comment createJavadocComment(final String text, final JavacNode field) {
+			return new Comment() {
+				@Override public String getText() {
+					return text;
+				}
+				
+				@Override public int getSourcePos(int index) {
+					return -1;
+				}
+				
+				@Override public CommentStyle getStyle() {
+					return CommentStyle.JAVADOC;
+				}
+				
+				@Override public boolean isDeprecated() {
+					return text.contains("@deprecated") && field.getKind() == Kind.FIELD && isFieldDeprecated(field);
+				}
+			};
+		}
+	}
+
+	@SuppressWarnings({"unchecked", "all"})
+	private static void copyJavadoc_jdk6_7(JavacNode from, JCTree to, CopyJavadoc copyMode, Object dc) {
+		Map<JCTree, String> docComments = (Map<JCTree, String>) dc;
+		String javadoc = docComments.get(from.get());
+		
+		if (javadoc != null) {
+			String[] filtered = copyMode.split(javadoc);
+			docComments.put(to, filtered[0]);
+			docComments.put(from.get(), filtered[1]);
+		}
 	}
 }

src/delombok/lombok/delombok/DocCommentIntegrator.java

@@ -66,7 +66,17 @@ public class DocCommentIntegrator {
 		if (map_ instanceof Map) {
 			((Map<JCTree, String>) map_).put(node, docCommentContent);
 			return true;
-		} else if (map_ instanceof DocCommentTable) {
+		} else if (Javac.instanceOfDocCommentTable(map_)) {
+			CommentAttacher_8.attach(node, docCommentContent, map_);
+			return true;
+		}
+		
+		return false;
+	}
+	
+	/* Container for code which will cause class loader exceptions on javac below 8. By being in a separate class, we avoid the problem. */
+	private static class CommentAttacher_8 {
+		static void attach(final JCTree node, String docCommentContent, Object map_) {
 			final String docCommentContent_ = docCommentContent;
 			((DocCommentTable) map_).putComment(node, new Comment() {
 				@Override public String getText() {
@@ -85,10 +95,7 @@ public class DocCommentIntegrator {
 					return JavacHandlerUtil.nodeHasDeprecatedFlag(node);
 				}
 			});
-			return true;
 		}
-		
-		return false;
 	}
 	
 	private JCTree findJavadocableNodeOnOrAfter(JCCompilationUnit unit, int endPos) {

src/utils/lombok/javac/Javac.java

@@ -103,6 +103,20 @@ public class Javac {
 		return 6;
 	}
 	
+	private static final Class<?> DOCCOMMENTTABLE_CLASS;
+	
+	static {
+		Class<?> c = null;
+		try {
+			c = Class.forName("com.sun.tools.javac.tree.DocCommentTable");
+		} catch (Throwable ignore) {}
+		DOCCOMMENTTABLE_CLASS = c;
+	}
+	
+	public static boolean instanceOfDocCommentTable(Object o) {
+		return DOCCOMMENTTABLE_CLASS != null && DOCCOMMENTTABLE_CLASS.isInstance(o);
+	}
+	
 	/**
 	 * Checks if the given expression (that really ought to refer to a type
 	 * expression) represents a primitive type.