Compiling Javac
I downloaded the javac sources and gave them a whirl with ant on my PowerBook. No success. They wouldn’t compile. I’m not sure whether this is because I’m using a Mac or because I’m using Java 5, and they want Java 6. There seem to be several missing or incompatible classes.
~/projects/compiler$ ant
Buildfile: build.xml
prep:
[mkdir] Created dir: /Users/elharo/Projects/compiler/build/bootclasses
[mkdir] Created dir: /Users/elharo/Projects/compiler/build/classes
[mkdir] Created dir: /Users/elharo/Projects/compiler/dist/bin
[mkdir] Created dir: /Users/elharo/Projects/compiler/dist/lib
check-javac.isuptodate:
build-lib.javac.jar:
[mkdir] Created dir: /Users/elharo/Projects/compiler/build/gensrc/com/sun/tools/javac
[copy] Copying 1 file to /Users/elharo/Projects/compiler/build/gensrc/com/sun/tools/javac/resources
[javac] Compiling 250 source files to /Users/elharo/Projects/compiler/build/bootclasses
[javac] /Users/elharo/Projects/compiler/src/share/classes/com/sun/tools/javac/tree/JCTree.java:84: interface expected here
[javac] public abstract class JCTree implements Tree, Cloneable, DiagnosticPosition {
[javac] ^
[javac] /Users/elharo/Projects/compiler/src/share/classes/com/sun/tools/javac/tree/JCTree.java:1793: cannot find symbol
[javac] symbol : class Kind
[javac] location: class com.sun.tools.javac.tree.JCTree.TypeBoundKind
[javac] public Kind getKind() {
[javac] ^
[javac] /Users/elharo/Projects/compiler/src/share/classes/com/sun/tools/javac/api/JavacTaskImpl.java:449: reference to Tree is ambiguous, both class com.sun.tools.javac.tree.Tree in com.sun.tools.javac.tree and class com.sun.source.tree.Tree in com.sun.source.tree match
[javac] public TypeMirror getTypeMirror(Iterable< ? extends Tree> path) {
[javac] ^
[javac] /Users/elharo/Projects/compiler/src/share/classes/com/sun/tools/javac/api/JavacTaskImpl.java:469: reference to Tree is ambiguous, both class com.sun.tools.javac.tree.Tree in com.sun.tools.javac.tree and class com.sun.source.tree.Tree in com.sun.source.tree match
[javac] public Iterable< ? extends Tree> pathFor(CompilationUnitTree unit, Tree node) {
[javac] ^
[javac] /Users/elharo/Projects/compiler/src/share/classes/com/sun/tools/javac/api/JavacTaskImpl.java:469: reference to Tree is ambiguous, both class com.sun.tools.javac.tree.Tree in com.sun.tools.javac.tree and class com.sun.source.tree.Tree in com.sun.source.tree match
[javac] public Iterable< ? extends Tree> pathFor(CompilationUnitTree unit, Tree node) {
[javac] ^
[javac] /Users/elharo/Projects/compiler/src/share/classes/com/sun/tools/javac/tree/JCTree.java:434: com.sun.tools.javac.tree.JCTree.JCCompilationUnit is not abstract and does not override abstract method getTypeDecls() in com.sun.source.tree.CompilationUnitTree
[javac] public static class JCCompilationUnit extends JCTree implements CompilationUnitTree {
[javac] ^
[javac] /Users/elharo/Projects/compiler/src/share/classes/com/sun/tools/javac/tree/JCTree.java:486: getTypeDecls() in com.sun.tools.javac.tree.JCTree.JCCompilationUnit cannot implement getTypeDecls() in com.sun.source.tree.CompilationUnitTree; attempting to use incompatible return type
[javac] found : com.sun.tools.javac.util.List<com .sun.tools.javac.tree.JCTree>
[javac] required: java.util.List< ? extends com.sun.source.tree.Tree>
[javac] public List<jctree> getTypeDecls() {
[javac] ^
[javac] /Users/elharo/Projects/compiler/src/share/classes/com/sun/tools/javac/tree/JCTree.java:503: com.sun.tools.javac.tree.JCTree.JCImport is not abstract and does not override abstract method getQualifiedIdentifier() in com.sun.source.tree.ImportTree
[javac] public static class JCImport extends JCTree implements ImportTree {
[javac] ^
[javac] /Users/elharo/Projects/compiler/src/share/classes/com/sun/tools/javac/tree/JCTree.java:515: getQualifiedIdentifier() in com.sun.tools.javac.tree.JCTree.JCImport cannot implement getQualifiedIdentifier() in com.sun.source.tree.ImportTree; attempting to use incompatible return type
[javac] found : com.sun.tools.javac.tree.JCTree
[javac] required: com.sun.source.tree.Tree
[javac] public JCTree getQualifiedIdentifier() { return qualid; }
[javac] ^
[javac] /Users/elharo/Projects/compiler/src/share/classes/com/sun/tools/javac/tree/JCTree.java:566: com.sun.tools.javac.tree.JCTree.JCClassDecl is not abstract and does not override abstract method getMembers() in com.sun.source.tree.ClassTree
[javac] public static class JCClassDecl extends JCStatement implements ClassTree {
[javac] ^
[javac] /Users/elharo/Projects/compiler/src/share/classes/com/sun/tools/javac/tree/JCTree.java:604: getMembers() in com.sun.tools.javac.tree.JCTree.JCClassDecl cannot implement getMembers() in com.sun.source.tree.ClassTree; attempting to use incompatible return type
[javac] found : com.sun.tools.javac.util.List<com .sun.tools.javac.tree.JCTree>
[javac] required: java.util.List< ? extends com.sun.source.tree.Tree>
[javac] public List<jctree> getMembers() {
[javac] ^
[javac] /Users/elharo/Projects/compiler/src/share/classes/com/sun/tools/javac/tree/JCTree.java:600: getExtendsClause() in com.sun.tools.javac.tree.JCTree.JCClassDecl cannot implement getExtendsClause() in com.sun.source.tree.ClassTree; attempting to use incompatible return type
[javac] found : com.sun.tools.javac.tree.JCTree
[javac] required: com.sun.source.tree.Tree
[javac] public JCTree getExtendsClause() { return extending; }
[javac] ^
[javac] /Users/elharo/Projects/compiler/src/share/classes/com/sun/tools/javac/tree/JCTree.java:624: com.sun.tools.javac.tree.JCTree.JCMethodDecl is not abstract and does not override abstract method getDefaultValue() in com.sun.source.tree.MethodTree
[javac] public static class JCMethodDecl extends JCTree implements MethodTree {
[javac] ^
[javac] /Users/elharo/Projects/compiler/src/share/classes/com/sun/tools/javac/tree/JCTree.java:672: getDefaultValue() in com.sun.tools.javac.tree.JCTree.JCMethodDecl cannot implement getDefaultValue() in com.sun.source.tree.MethodTree; attempting to use incompatible return type
[javac] found : com.sun.tools.javac.tree.JCTree
[javac] required: com.sun.source.tree.Tree
[javac] public JCTree getDefaultValue() { // for annotation types
[javac] ^
[javac] /Users/elharo/Projects/compiler/src/share/classes/com/sun/tools/javac/tree/JCTree.java:661: getReturnType() in com.sun.tools.javac.tree.JCTree.JCMethodDecl cannot implement getReturnType() in com.sun.source.tree.MethodTree; attempting to use incompatible return type
[javac] found : com.sun.tools.javac.tree.JCTree
[javac] required: com.sun.source.tree.Tree
[javac] public JCTree getReturnType() { return restype; }
[javac] ^
[javac] /Users/elharo/Projects/compiler/src/share/classes/com/sun/tools/javac/tree/JCTree.java:689: com.sun.tools.javac.tree.JCTree.JCVariableDecl is not abstract and does not override abstract method getType() in com.sun.source.tree.VariableTree
[javac] public static class JCVariableDecl extends JCStatement implements VariableTree {
[javac] ^
[javac] /Users/elharo/Projects/compiler/src/share/classes/com/sun/tools/javac/tree/JCTree.java:713: getType() in com.sun.tools.javac.tree.JCTree.JCVariableDecl cannot implement getType() in com.sun.source.tree.VariableTree; attempting to use incompatible return type
[javac] found : com.sun.tools.javac.tree.JCTree
[javac] required: com.sun.source.tree.Tree
[javac] public JCTree getType() { return vartype; }
[javac] ^
[javac] /Users/elharo/Projects/compiler/src/share/classes/com/sun/tools/javac/tree/JCTree.java:1456: com.sun.tools.javac.tree.JCTree.JCTypeCast is not abstract and does not override abstract method getType() in com.sun.source.tree.TypeCastTree
[javac] public static class JCTypeCast extends JCExpression implements TypeCastTree {
[javac] ^
[javac] /Users/elharo/Projects/compiler/src/share/classes/com/sun/tools/javac/tree/JCTree.java:1468: getType() in com.sun.tools.javac.tree.JCTree.JCTypeCast cannot implement getType() in com.sun.source.tree.TypeCastTree; attempting to use incompatible return type
[javac] found : com.sun.tools.javac.tree.JCTree
[javac] required: com.sun.source.tree.Tree
[javac] public JCTree getType() { return clazz; }
[javac] ^
[javac] /Users/elharo/Projects/compiler/src/share/classes/com/sun/tools/javac/tree/JCTree.java:1479: com.sun.tools.javac.tree.JCTree.JCInstanceOf is not abstract and does not override abstract method getType() in com.sun.source.tree.InstanceOfTree
[javac] public static class JCInstanceOf extends JCExpression implements InstanceOfTree {
[javac] ^
[javac] /Users/elharo/Projects/compiler/src/share/classes/com/sun/tools/javac/tree/JCTree.java:1491: getType() in com.sun.tools.javac.tree.JCTree.JCInstanceOf cannot implement getType() in com.sun.source.tree.InstanceOfTree; attempting to use incompatible return type
[javac] found : com.sun.tools.javac.tree.JCTree
[javac] required: com.sun.source.tree.Tree
[javac] public JCTree getType() { return clazz; }
[javac] ^
[javac] /Users/elharo/Projects/compiler/src/share/classes/com/sun/tools/javac/tree/JCTree.java:1685: com.sun.tools.javac.tree.JCTree.JCArrayTypeTree is not abstract and does not override abstract method getType() in com.sun.source.tree.ArrayTypeTree
[javac] public static class JCArrayTypeTree extends JCExpression implements ArrayTypeTree {
[javac] ^
[javac] /Users/elharo/Projects/compiler/src/share/classes/com/sun/tools/javac/tree/JCTree.java:1695: getType() in com.sun.tools.javac.tree.JCTree.JCArrayTypeTree cannot implement getType() in com.sun.source.tree.ArrayTypeTree; attempting to use incompatible return type
[javac] found : com.sun.tools.javac.tree.JCTree
[javac] required: com.sun.source.tree.Tree
[javac] public JCTree getType() { return elemtype; }
[javac] ^
[javac] /Users/elharo/Projects/compiler/src/share/classes/com/sun/tools/javac/tree/JCTree.java:1705: com.sun.tools.javac.tree.JCTree.JCTypeApply is not abstract and does not override abstract method getType() in com.sun.source.tree.ParameterizedTypeTree
[javac] public static class JCTypeApply extends JCExpression implements ParameterizedTypeTree {
[javac] ^
[javac] /Users/elharo/Projects/compiler/src/share/classes/com/sun/tools/javac/tree/JCTree.java:1717: getType() in com.sun.tools.javac.tree.JCTree.JCTypeApply cannot implement getType() in com.sun.source.tree.ParameterizedTypeTree; attempting to use incompatible return type
[javac] found : com.sun.tools.javac.tree.JCTree
[javac] required: com.sun.source.tree.Tree
[javac] public JCTree getType() { return clazz; }
[javac] ^
[javac] /Users/elharo/Projects/compiler/src/share/classes/com/sun/tools/javac/tree/JCTree.java:1754: com.sun.tools.javac.tree.JCTree.JCWildcard is not abstract and does not override abstract method getBound() in com.sun.source.tree.WildcardTree
[javac] public static class JCWildcard extends JCExpression implements WildcardTree {
[javac] ^
[javac] /Users/elharo/Projects/compiler/src/share/classes/com/sun/tools/javac/tree/JCTree.java:1777: getBound() in com.sun.tools.javac.tree.JCTree.JCWildcard cannot implement getBound() in com.sun.source.tree.WildcardTree; attempting to use incompatible return type
[javac] found : com.sun.tools.javac.tree.JCTree
[javac] required: com.sun.source.tree.Tree
[javac] public JCTree getBound() { return inner; }
[javac] ^
[javac] /Users/elharo/Projects/compiler/src/share/classes/com/sun/tools/javac/tree/JCTree.java:1802: com.sun.tools.javac.tree.JCTree.JCAnnotation is not abstract and does not override abstract method getAnnotationType() in com.sun.source.tree.AnnotationTree
[javac] public static class JCAnnotation extends JCExpression implements AnnotationTree {
[javac] ^
[javac] /Users/elharo/Projects/compiler/src/share/classes/com/sun/tools/javac/tree/JCTree.java:1814: getAnnotationType() in com.sun.tools.javac.tree.JCTree.JCAnnotation cannot implement getAnnotationType() in com.sun.source.tree.AnnotationTree; attempting to use incompatible return type
[javac] found : com.sun.tools.javac.tree.JCTree
[javac] required: com.sun.source.tree.Tree
[javac] public JCTree getAnnotationType() { return annotationType; }
[javac] ^
[javac] /Users/elharo/Projects/compiler/src/share/classes/com/sun/tools/javac/tree/JCTree.java:1848: com.sun.tools.javac.tree.JCTree.JCErroneous is not abstract and does not override abstract method getErrorTrees() in com.sun.source.tree.ErroneousTree
[javac] public static class JCErroneous extends JCExpression
[javac] ^
[javac] /Users/elharo/Projects/compiler/src/share/classes/com/sun/tools/javac/tree/JCTree.java:1860: getErrorTrees() in com.sun.tools.javac.tree.JCTree.JCErroneous cannot implement getErrorTrees() in com.sun.source.tree.ErroneousTree; attempting to use incompatible return type
[javac] found : com.sun.tools.javac.util.List<com .sun.tools.javac.tree.JCTree>
[javac] required: java.util.List< ? extends com.sun.source.tree.Tree>
[javac] public List<jctree> getErrorTrees() {
[javac] ^
[javac] /Users/elharo/Projects/compiler/src/share/classes/com/sun/tools/javac/api/JavacTaskImpl.java:451: reference to Tree is ambiguous, both class com.sun.tools.javac.tree.Tree in com.sun.tools.javac.tree and class com.sun.source.tree.Tree in com.sun.source.tree match
[javac] Tree last = null;
[javac] ^
[javac] /Users/elharo/Projects/compiler/src/share/classes/com/sun/tools/javac/api/JavacTaskImpl.java:452: reference to Tree is ambiguous, both class com.sun.tools.javac.tree.Tree in com.sun.tools.javac.tree and class com.sun.source.tree.Tree in com.sun.source.tree match
[javac] for (Tree node : path)
[javac] ^
[javac] /Users/elharo/Projects/compiler/src/share/classes/com/sun/tools/javac/api/JavacTrees.java:80: com.sun.tools.javac.api.JavacTrees is not abstract and does not override abstract method getTree(javax.lang.model.element.Element,javax.lang.model.element.AnnotationMirror,javax.lang.model.element.AnnotationValue) in com.sun.source.util.Trees
[javac] public class JavacTrees extends Trees {
[javac] ^
[javac] /Users/elharo/Projects/compiler/src/share/classes/com/sun/tools/javac/api/JavacTrees.java:164: getTree(javax.lang.model.element.Element,javax.lang.model.element.AnnotationMirror,javax.lang.model.element.AnnotationValue) in com.sun.tools.javac.api.JavacTrees cannot override getTree(javax.lang.model.element.Element,javax.lang.model.element.AnnotationMirror,javax.lang.model.element.AnnotationValue) in com.sun.source.util.Trees; attempting to use incompatible return type
[javac] found : com.sun.tools.javac.tree.JCTree
[javac] required: com.sun.source.tree.Tree
[javac] public JCTree getTree(Element e, AnnotationMirror a, AnnotationValue v) {
[javac] ^
[javac] /Users/elharo/Projects/compiler/src/share/classes/com/sun/tools/javac/api/JavacTrees.java:160: getTree(javax.lang.model.element.Element,javax.lang.model.element.AnnotationMirror) in com.sun.tools.javac.api.JavacTrees cannot override getTree(javax.lang.model.element.Element,javax.lang.model.element.AnnotationMirror) in com.sun.source.util.Trees; attempting to use incompatible return type
[javac] found : com.sun.tools.javac.tree.JCTree
[javac] required: com.sun.source.tree.Tree
[javac] public JCTree getTree(Element e, AnnotationMirror a) {
[javac] ^
[javac] /Users/elharo/Projects/compiler/src/share/classes/com/sun/tools/javac/api/JavacTrees.java:143: getTree(javax.lang.model.element.Element) in com.sun.tools.javac.api.JavacTrees cannot override getTree(javax.lang.model.element.Element) in com.sun.source.util.Trees; attempting to use incompatible return type
[javac] found : com.sun.tools.javac.tree.JCTree
[javac] required: com.sun.source.tree.Tree
[javac] public JCTree getTree(Element element) {
[javac] ^
[javac] /Users/elharo/Projects/compiler/src/share/classes/com/sun/tools/javac/api/JavacTrees.java:187: cannot find symbol
[javac] symbol : method getPath(com.sun.tools.javac.tree.JCTree.JCCompilationUnit,com.sun.tools.javac.tree.JCTree)
[javac] location: class com.sun.source.util.TreePath
[javac] return TreePath.getPath(treeTopLevel.snd, treeTopLevel.fst);
[javac] ^
[javac] /Users/elharo/Projects/compiler/src/share/classes/com/sun/tools/javac/tree/TreeCopier.java:45: com.sun.tools.javac.tree.TreeCopier is not abstract and does not override abstract method visitOther(com.sun.source.tree.Tree,P) in com.sun.source.tree.TreeVisitor
[javac] public class TreeCopier<p> implements TreeVisitor<jctree ,P> {
[javac] ^
[javac] /Users/elharo/Projects/compiler/src/share/classes/com/sun/tools/javac/tree/TreeCopier.java:403: inconvertible types
[javac] found : com.sun.tools.javac.tree.Tree
[javac] required: com.sun.tools.javac.tree.JCTree
[javac] JCTree tree = (JCTree) node;
[javac] ^
[javac] /Users/elharo/Projects/compiler/src/share/classes/com/sun/tools/javac/tree/TreeCopier.java:406: inconvertible types
[javac] found : com.sun.tools.javac.tree.Tree
[javac] required: com.sun.tools.javac.tree.JCTree.LetExpr
[javac] LetExpr t = (LetExpr) node;
[javac] ^
[javac] 41 errors
</jctree></p></jctree></com></jctree></com></jctree></com><
I loaded the code into Eclipse, which also complains about some classes. One thing I noticed: they haven’t been using static code analyzers as much as I would. There are lots of unused imports here. Maybe NetBeans isn’t as aggressive as Eclipse about removing such detritus?
November 17th, 2006 at 1:26 AM
I don’t know about aggressive, but it’s certainly not as automated. As I recall, Eclipse highlights things like unused imports, whereas Netbeans is a manual process (Alt+Shift+F/Fix Imports). So if you don’t remember to do it, and aren’t running checkstyle, things like that will get missed.
November 17th, 2006 at 12:20 PM
Were you able to compile it under 1.5? I was able to do a compile from the netbeans project for javac but needed 1.6.
November 17th, 2006 at 4:46 PM
The new version of NB (6.0 nightly) is a lot more agressive with regard
to unused imports – it now grays them down.
November 19th, 2006 at 1:24 PM
I’m pretty sure the *Tree classes they reference are part of the Java Compiler Tree API, in Java 6, which are currently Sun-only classes. There’s a compiler API, which is public, but they’ve exposed an API for the AST so that people can write tools against the AST if they like.
Patrick