javassist/src/test/javassist/JvstTest5.java

package javassist;

import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import java.lang.annotation.Annotation;
import java.lang.reflect.Method;
import java.lang.reflect.TypeVariable;

import javassist.bytecode.AccessFlag;
import javassist.bytecode.AnnotationsAttribute;
import javassist.bytecode.AttributeInfo;
import javassist.bytecode.ClassFile;
import javassist.bytecode.ConstPool;
import javassist.bytecode.InnerClassesAttribute;
import javassist.bytecode.MethodInfo;
import javassist.bytecode.MethodParametersAttribute;
import javassist.bytecode.NestHostAttribute;
import javassist.bytecode.NestMembersAttribute;
import javassist.expr.ExprEditor;
import javassist.expr.Handler;
import javassist.expr.MethodCall;
import javassist.expr.NewExpr;
import junit.framework.Assert;

@SuppressWarnings({"rawtypes","unchecked","unused"})
public class JvstTest5 extends JvstTestRoot {

    public void testDollarClassInStaticMethod() throws Exception {
        CtClass cc = sloader.makeClass("test5.DollarClass");
        CtMethod m = CtNewMethod.make("public static int run(){ return $class.getName().length(); }", cc);
        cc.addMethod(m);
        m = CtNewMethod.make("public int run2(){ return $class.getName().length(); }", cc);
        cc.addMethod(m);
        cc.writeFile();
        Object obj = make(cc.getName());
        assertEquals(cc.getName().length(), invoke(obj, "run"));
        assertEquals(cc.getName().length(), invoke(obj, "run2"));
    }

    public void testSuperDefaultMethodCall() throws Exception {
        CtClass cc = sloader.get("test5.DefaultMethod");
        CtMethod m = CtNewMethod.make("public int run(){ return test5.DefaultMethodIntf.super.foo(); }", cc);
        cc.addMethod(m);
        m = CtNewMethod.make("public int run2(){ return test5.DefaultMethodIntf.baz(); }", cc);
        cc.addMethod(m);
        m = CtNewMethod.make("public int run3(){ return test5.DefaultMethodIntf.super.baz(); }", cc);
        cc.addMethod(m);
        cc.writeFile();
        Object obj = make(cc.getName());
        assertEquals(1, invoke(obj, "run"));
        assertEquals(10, invoke(obj, "run2"));
        assertEquals(10, invoke(obj, "run3"));
    }

    public void testTypeAnno() throws Exception {
        CtClass cc = sloader.get("test5.TypeAnno");
        cc.getClassFile().compact();
        cc.writeFile();
        Object obj = make(cc.getName());
        TypeVariable<?> t = obj.getClass().getTypeParameters()[0];
        Annotation[] annos = t.getAnnotations();
        assertEquals("@test5.TypeAnnoA()", annos[0].toString());
    }

    public void testJIRA241() throws Exception {
        CtClass cc = sloader.get("test5.JIRA241");
        CtMethod testMethod = cc.getDeclaredMethod("test");
        testMethod.insertAfter("System.out.println(\"inserted!\");");
        cc.writeFile();
        Object obj = make(cc.getName());
        assertEquals(10, invoke(obj, "run"));
    }

    public void testJIRA246() throws Exception {
        CtClass ctClass = sloader.makeClass("test5.JIRA246Test");
        ctClass.addInterface(sloader.get(test5.JIRA246.Test.class.getName()));
        String methodBody = "public void test() { defaultMethod(); }";
        CtMethod ctMethod = CtMethod.make(methodBody, ctClass);
        ctClass.addMethod(ctMethod);
    }

    public void testJIRA246b() throws Exception {
        CtClass ctClass = sloader.get(test5.JIRA246.A.class.getName());
        String src = "public void id() { get(); }";
        CtMethod make = CtNewMethod.make(src, ctClass);
    }

    public void testJIRA242() throws Exception {
        Boolean ss = Boolean.valueOf(2 > 3);
        ClassPool cp = ClassPool.getDefault();
        CtClass cc = cp.get("test5.JIRA242$Hello");
        CtMethod m = cc.getDeclaredMethod("say");
        m.insertBefore("{ System.out.println(\"Say Hello...\"); }");

        StringBuilder sb = new StringBuilder();
        sb.append("BOOL_SERIES = createBooleanSeriesStep();");
        //Below code cause the issue
        sb.append("BOOL_SERIES.setValue(3>=3);"); //lets comment this and run it will work 
        // Below code snippets will work
        // this cast into exact class and call the same function
        sb.append("((test5.JIRA242$BooleanDataSeries)BOOL_SERIES).setValue(3>=3);");
        // this code snippet will set exact boolean variable to the function.
        sb.append("boolean var = 3>=3;");
        sb.append("BOOL_SERIES.setValue(var);");

        m.insertBefore(sb.toString());
        cc.writeFile();
        Object obj = make(cc.getName());
        assertEquals(0, invoke(obj, "say"));
    }

    public void testJIRA249() throws Exception {
        CtClass cc = sloader.get("test5.BoolTest");
        CtMethod testMethod = cc.getDeclaredMethod("test");
        testMethod.insertBefore("i = foo(true & true);");
        cc.writeFile();
        Object obj = make(cc.getName());
        assertEquals(1, invoke(obj, "run"));
    }

    public void testInnerClassAttributeRemove() throws Exception {
        CtClass cc = sloader.get("test5.InnerClassRemove");
        ClassFile cf = cc.getClassFile();
        InnerClassesAttribute ica = (InnerClassesAttribute)cf.getAttribute(InnerClassesAttribute.tag);
        String second = ica.innerClass(1);
        String secondName = ica.innerName(1);
        String third = ica.innerClass(2);
        String thirdName = ica.innerName(2);
        assertEquals(3, ica.remove(3));
        assertEquals(2, ica.remove(0));
        assertEquals(second, ica.innerClass(0));
        assertEquals(secondName, ica.innerName(0));
        assertEquals(third, ica.innerClass(1));
        assertEquals(thirdName, ica.innerName(1));
        assertEquals(1, ica.remove(1));
        assertEquals(second, ica.innerClass(0));
        assertEquals(secondName, ica.innerName(0));
        cc.writeFile();
        Object obj = make(cc.getName());
        assertEquals(1, invoke(obj, "run"));
    }

    public void testJIRA248() throws Exception {
        CtClass cc = sloader.get("test5.JIRA248");
        String methodBody = "public int run() { return foo() + super.foo() + super.bar() + test5.JIRA248Intf2.super.baz(); }";
        CtMethod ctMethod = CtMethod.make(methodBody, cc);
        cc.addMethod(ctMethod);
        cc.writeFile();
        Object obj = make(cc.getName());
        assertEquals(40271, invoke(obj, "run"));
    }

    public void testInvalidCastWithDollar() throws Exception {
        String code = "{ new test5.JavassistInvalidCastTest().inspectReturn((Object) ($w) $_); } ";
        CtClass c = sloader.get("test5.InvalidCastDollar");
        for (CtMethod method : c.getDeclaredMethods())
            method.insertAfter(code);
    }

    public void testJIRA256() throws Exception {
        // CtClass ec = sloader.get("test5.Entity");

        CtClass cc = sloader.makeClass("test5.JIRA256");
        ClassFile ccFile = cc.getClassFile();
        ConstPool constpool = ccFile.getConstPool();

        AnnotationsAttribute attr = new AnnotationsAttribute(constpool, AnnotationsAttribute.visibleTag);
        javassist.bytecode.annotation.Annotation entityAnno
            = new javassist.bytecode.annotation.Annotation("test5.Entity", constpool);
            // = new javassist.bytecode.annotation.Annotation(constpool, ec);

        entityAnno.addMemberValue("value", new javassist.bytecode.annotation.ArrayMemberValue(constpool));
        attr.addAnnotation(entityAnno);
        ccFile.addAttribute(attr);

        cc.writeFile();
        Object o = make(cc.getName());
        assertTrue(o.getClass().getName().equals("test5.JIRA256"));

        java.lang.annotation.Annotation[] annotations = o.getClass().getDeclaredAnnotations();
        assertEquals(1, annotations.length);
    }

    public void testJIRA250() throws Exception {
        CtClass cc = sloader.makeClass("test5.JIRA250", sloader.get("test5.JIRA250Super"));
        cc.addMethod(CtNewMethod.make(
                "    public test5.JIRA250Bar getBar() {" + 
                "        return super.getBar();\n" +
                "    }\n", cc));
        cc.addMethod(CtNewMethod.make("public int run() { getBar(); return 1; }", cc));
        cc.writeFile();
        Object obj = make(cc.getName());
        assertEquals(1, invoke(obj, "run"));
    }

    public void testProceedToDefaultMethod() throws Exception {
        CtClass cc = ClassPool.getDefault().get("test5.ProceedDefault");
        CtMethod mth = cc.getDeclaredMethod("bar");
        mth.instrument(new ExprEditor() {
            public void edit(MethodCall c) throws CannotCompileException {
                c.replace("$_ = $proceed($$) + 10000;");
            }
        });
        cc.writeFile();
        Object obj = make(cc.getName());
        assertEquals(21713, invoke(obj, "run"));
    }

    public void testBadClass() throws Exception {
        CtClass badClass = ClassPool.getDefault().makeClass("badClass");
        String src = String.join(System.getProperty("line.separator"),
                "public void eval () {",
                "    if (true) {",
                "        double t=0;",
                "    } else {",
                "        double t=0;",
                "    }",
                "    for (int i=0; i < 2; i++) {",
                "        int a=0;",
                "        int b=0;",
                "        int c=0;",
                "        int d=0;",
                "        if (true) {",
                "            int e = 0;",
                "        }",
                "    }",
                "}");
        System.out.println(src);
        badClass.addMethod(CtMethod.make(src, badClass));
        Class clazzz = badClass.toClass(Class.forName("DefineClassCapability"));
        Object obj = clazzz.getConstructor().newInstance(); // <-- falls here
    }

    public void test83StackmapWithArrayType() throws Exception {
    	final CtClass ctClass = sloader.get("test5.StackmapWithArray83");
        final CtMethod method = ctClass.getDeclaredMethod("bytecodeVerifyError");
        method.addLocalVariable("test_localVariable", CtClass.intType);
        method.insertBefore("{ test_localVariable = 1; }");

        final CtMethod method2 = ctClass.getDeclaredMethod("bytecodeVerifyError2");
        method2.addLocalVariable("test_localVariable", CtClass.intType);
        method2.insertBefore("{ test_localVariable = 1; }");

        ctClass.writeFile();
        Object obj = make(ctClass.getName());
        assertEquals(1, invoke(obj, "run"));
    }

    public void testLoaderClassPath() throws Exception {
        ClassPool cp = new ClassPool();
        cp.appendClassPath(new LoaderClassPath(new Loader()));
        assertNotNull(cp.get(Object.class.getName()));
        assertNotNull(cp.get(this.getClass().getName()));
    }

    public void testAddDefaultMethod() throws Exception {
        CtClass cc = sloader.makeInterface("test5.AddDefaultMethod");
        cc.addMethod(CtNewMethod.make("static int foo() { return 1; }", cc));
        cc.addMethod(CtNewMethod.make("public static int foo1() { return 1; }", cc));
        cc.addMethod(CtNewMethod.make("public int foo2() { return 1; }", cc));
        cc.addMethod(CtNewMethod.make("int foo3() { return 1; }", cc));
        try {
            cc.addMethod(CtNewMethod.make("private int foo4() { return 1; }", cc));
            fail();
        } catch (CannotCompileException e) {}
        try {
            cc.addMethod(CtNewMethod.make("private static int foo5() { return 1; }", cc));
            fail();
        } catch (CannotCompileException e) {}
    }

    public void testRemoveAnnotatino() throws Exception {
        CtClass cc = sloader.get("test5.RemoveAnnotation");
        AnnotationsAttribute aa
            = (AnnotationsAttribute)cc.getClassFile().getAttribute(AnnotationsAttribute.invisibleTag);
        assertTrue(aa.removeAnnotation("test5.RemoveAnno1"));
        AttributeInfo ai = cc.getClassFile().removeAttribute(AnnotationsAttribute.invisibleTag);
        assertEquals(ai.getName(), AnnotationsAttribute.invisibleTag);

        CtMethod foo = cc.getDeclaredMethod("foo");
        AnnotationsAttribute aa2 = (AnnotationsAttribute)foo.getMethodInfo().getAttribute(AnnotationsAttribute.invisibleTag);
        assertTrue(aa2.removeAnnotation("test5.RemoveAnno1"));

        CtMethod bar = cc.getDeclaredMethod("bar");
        AnnotationsAttribute aa3 = (AnnotationsAttribute)bar.getMethodInfo().getAttribute(AnnotationsAttribute.invisibleTag);
        assertFalse(aa3.removeAnnotation("test5.RemoveAnno1"));
        assertTrue(aa3.removeAnnotation("test5.RemoveAnno2"));
        AttributeInfo ai2 = bar.getMethodInfo().removeAttribute(AnnotationsAttribute.invisibleTag);
        assertEquals(ai2.getName(), AnnotationsAttribute.invisibleTag);

        CtMethod run = cc.getDeclaredMethod("run");
        AttributeInfo ai3 = run.getMethodInfo().removeAttribute(AnnotationsAttribute.invisibleTag);
        assertNull(ai3);

        CtField baz = cc.getDeclaredField("baz");
        AttributeInfo ai4 = baz.getFieldInfo().removeAttribute(AnnotationsAttribute.invisibleTag);
        assertEquals(ai4.getName(), AnnotationsAttribute.invisibleTag);

        cc.writeFile();
        Object obj = make(cc.getName());
        assertEquals(3, invoke(obj, "run"));
    }

    public void testInnerClassModifiers() throws Exception {
        CtClass cc = sloader.get("test5.InnerModifier$NonStatic");
        try {
            cc.setModifiers(Modifier.PUBLIC | Modifier.STATIC);
            fail();
        }
        catch (RuntimeException e) {
            if (!e.getMessage().startsWith("cannot change "))
                fail();
        }

        cc.setModifiers(Modifier.PUBLIC);
        cc.writeFile();

        assertEquals(Modifier.PUBLIC, cc.getModifiers());
        InnerClassesAttribute ica = getInnerClassAttr(cc);
        int i = ica.find("test5.InnerModifier$NonStatic");
        assertTrue(i >= 0);
        assertEquals(Modifier.PUBLIC, ica.accessFlags(i));

        CtClass cc2 = sloader.get("test5.InnerModifier$Static");

        InnerClassesAttribute ica3 = getInnerClassAttr(cc2);
        int i3 = ica3.find("test5.InnerModifier$Static");
        assertTrue(i3 >= 0);
        assertEquals(AccessFlag.STATIC, ica3.accessFlags(i3));

        cc2.setModifiers(Modifier.PROTECTED | Modifier.STATIC);
        cc2.setModifiers(Modifier.PUBLIC);
        cc2.writeFile();

        assertEquals(Modifier.PUBLIC | Modifier.STATIC, cc2.getModifiers());
        InnerClassesAttribute ica2 = getInnerClassAttr(cc2);
        int i2 = ica2.find("test5.InnerModifier$Static");
        assertTrue(i2 >= 0);
        assertEquals(AccessFlag.PUBLIC | AccessFlag.STATIC, ica2.accessFlags(i2));

        CtClass cc3 = cc.getDeclaringClass();
        assertTrue(cc3.isModified());
        cc3.writeFile();

        InnerClassesAttribute ica4 = getInnerClassAttr(cc3);
        int i4 = ica4.find("test5.InnerModifier$Static");
        assertTrue(i4 >= 0);
        assertEquals(AccessFlag.PUBLIC | AccessFlag.STATIC, ica4.accessFlags(i4));
        int i5 = ica4.find("test5.InnerModifier$NonStatic");
        assertTrue(i5 >= 0);
        assertEquals(Modifier.PUBLIC, ica4.accessFlags(i5));
    }

    public void testInnerClassModifiers2() throws Exception {
        CtClass cc = sloader.get("test5.InnerModifier2$Protected");
        Class<?> ccc = Class.forName("test5.InnerModifier2$Protected");
        assertEquals(cc.getModifiers(), ccc.getModifiers());
        assertTrue(Modifier.isProtected(cc.getModifiers()));

        cc = sloader.get("test5.InnerModifier2$Public");
        ccc = Class.forName("test5.InnerModifier2$Public");
        assertEquals(cc.getModifiers(), ccc.getModifiers());
        assertTrue(Modifier.isPublic(cc.getModifiers()));

        cc = sloader.get("test5.InnerModifier2$Private");
        ccc = Class.forName("test5.InnerModifier2$Private");
        assertEquals(cc.getModifiers(), ccc.getModifiers());
        assertTrue(Modifier.isPrivate(cc.getModifiers()));

        cc = sloader.get("test5.InnerModifier2$Package");
        ccc = Class.forName("test5.InnerModifier2$Package");
        assertEquals(cc.getModifiers(), ccc.getModifiers());
        assertTrue(Modifier.isPackage(cc.getModifiers()));

        cc = sloader.get("test5.InnerModifier2$ProtectedStatic");
        ccc = Class.forName("test5.InnerModifier2$ProtectedStatic");
        assertEquals(cc.getModifiers(), ccc.getModifiers());
        assertTrue(Modifier.isProtected(cc.getModifiers()));
        assertTrue(Modifier.isStatic(cc.getModifiers()));

        cc = sloader.get("test5.InnerModifier2$PublicStatic");
        ccc = Class.forName("test5.InnerModifier2$PublicStatic");
        assertEquals(cc.getModifiers(), ccc.getModifiers());
        assertTrue(Modifier.isPublic(cc.getModifiers()));
        assertTrue(Modifier.isStatic(cc.getModifiers()));

        cc = sloader.get("test5.InnerModifier2$PrivateStatic");
        ccc = Class.forName("test5.InnerModifier2$PrivateStatic");
        assertEquals(cc.getModifiers(), ccc.getModifiers());
        assertTrue(Modifier.isPrivate(cc.getModifiers()));
        assertTrue(Modifier.isStatic(cc.getModifiers()));

        cc = sloader.get("test5.InnerModifier2$PackageStatic");
        ccc = Class.forName("test5.InnerModifier2$PackageStatic");
        assertEquals(cc.getModifiers(), ccc.getModifiers());
        assertTrue(Modifier.isPackage(cc.getModifiers()));
        assertTrue(Modifier.isStatic(cc.getModifiers()));
    }

    private InnerClassesAttribute getInnerClassAttr(CtClass cc) {
        return (InnerClassesAttribute)cc.getClassFile2().getAttribute(InnerClassesAttribute.tag);
    }

    public void testVarArgsModifier() throws Exception {
        CtClass cc = sloader.get("test5.VarArgsMethod");
        assertTrue(Modifier.isVarArgs(cc.getDeclaredMethod("foo").getModifiers()));
        assertFalse(Modifier.isVarArgs(cc.getDeclaredMethod("bar").getModifiers()));
    }

    public void testIssue155() throws Exception {
        CtClass cc = sloader.get("test5.Issue155");
        CtMethod testMethod = cc.getDeclaredMethod("foo");
        testMethod.instrument(
                new ExprEditor() {
                    public void edit(Handler m)
                            throws CannotCompileException {
                        m.insertBefore("throw $1;");
                    }
                });

        cc.writeFile();
        Object obj = make(cc.getName());
        assertEquals(1, invoke(obj, "test"));
    }

    public void testNestHostAttribute() throws Exception {
        CtClass cc = sloader.get("test5.NestHost$Foo");
        ClassFile cf = cc.getClassFile();
        NestHostAttribute attr = (NestHostAttribute)cf.getAttribute(NestHostAttribute.tag);
        assertEquals(test5.NestHost.class.getName(),
                     cf.getConstPool().getClassInfo(attr.hostClassIndex()));
    }

    public void testNestMembersAttribute() throws Exception {
        CtClass cc = sloader.get("test5.NestHost");
        ClassFile cf = cc.getClassFile();
        NestMembersAttribute attr = (NestMembersAttribute)cf.getAttribute(NestMembersAttribute.tag);
        assertEquals(2, attr.numberOfClasses());
        String[] names = new String[2];
        for (int i = 0; i < 2; i++)
            names[i] = cf.getConstPool().getClassInfo(attr.memberClass(i));
        
        assertFalse(names[0].equals(names[1]));
        assertTrue(names[0].equals("test5.NestHost$Foo") || names[0].equals("test5.NestHost$Bar"));
        assertTrue(names[1].equals("test5.NestHost$Foo") || names[1].equals("test5.NestHost$Bar"));
    }

    public void testNestMembersAttributeCopy() throws Exception {
        CtClass cc = sloader.get("test5.NestHost2");
        cc.getClassFile().compact();
        cc.writeFile();
        make(cc.getName());
    }

    public void testNestHostAttributeCopy() throws Exception {
        CtClass cc = sloader.get("test5.NestHost2$Foo");
        cc.getClassFile().compact();
        cc.toClass(test5.DefineClassCapability.class);
    }

    public void testSwitchCaseWithStringConstant() throws Exception {
        CtClass cc = sloader.get("test5.SwitchCase");
        cc.addMethod(CtNewMethod.make(
                "public int run() {" +
                "    String s = \"foobar\";\n" +
                "    switch (s) {\n" +
                "    case STR1: return 1;\n" +
                "    case \"foobar\": return 2;\n" +
                "    default: return 3; }\n" +
                "}\n", cc));
        cc.writeFile();
        Object obj = make(cc.getName());
        assertEquals(2, invoke(obj, "run"));   
    }

    public void testNestPrivateConstructor() throws Exception {
        CtClass cc = sloader.get("test5.NestHost3$Builder");
        cc.instrument(new ExprEditor() {
            public void edit(NewExpr e) throws CannotCompileException {
                String code = "$_ = $proceed($$);";
                e.replace(code);
            }
        });
        cc.writeFile();
        try {
            Class<?> nestHost3Class = cloader.loadClass("test5.NestHost3");
            Object builder = nestHost3Class.getDeclaredMethod("builder").invoke(nestHost3Class);
            Class<?> nestHost3BuilderClass = cloader.loadClass("test5.NestHost3$Builder");
            nestHost3BuilderClass.getDeclaredMethod("build").invoke(builder);
        } catch (Exception ex) {
            ex.printStackTrace();
            fail("it should be able to access the private constructor of the nest host");
        }
    }

    public void testNestPrivateConstructor2() throws Exception {
        CtClass cc = sloader.get("test5.NestHost4$InnerClass1");
        cc.instrument(new ExprEditor() {
            public void edit(NewExpr e) throws CannotCompileException {
                String code = "$_ = $proceed($$);";
                e.replace(code);
            }
        });
        cc.writeFile();

        cc = sloader.get("test5.NestHost4$InnerClass1$InnerClass5");
        cc.instrument(new ExprEditor() {
            public void edit(NewExpr e) throws CannotCompileException {
                String code = "$_ = $proceed($$);";
                e.replace(code);
            }
        });
        cc.writeFile();
        try {
            Class<?> nestHost4Class = cloader.loadClass("test5.NestHost4");
            nestHost4Class.getDeclaredConstructor().newInstance();
        } catch (Exception ex) {
            ex.printStackTrace();
            fail("it should be able to access the private constructor of the nest host");
        }
    }

    public void testSwitchCaseWithStringConstant2() throws Exception {
        CtClass cc = sloader.makeClass("test5.SwitchCase2");
        cc.addMethod(CtNewMethod.make(
                "public int run() {" +
                "    String s = \"foo\";\n" +
                "    switch (s) {\n" +
                "    case test5.SwitchCase.STR1: return 1;\n" +
                "    case \"foobar\": return 2;\n" +
                "    }\n" +
                "    return 3;\n" +
                "}\n", cc));
        cc.writeFile();
        Object obj = make(cc.getName());
        assertEquals(1, invoke(obj, "run"));   
    }

    // Issue #241
    public void testInsertBeforeAndDollarR() throws Exception {
        CtClass cc = sloader.get(test5.InsertBeforeDollarR.class.getName());
        CtMethod m = cc.getDeclaredMethod("foo");
        m.insertBefore("{ if ($1 == 1) return ($r)$2; }");
        try {
            m.insertBefore("{ $_ = \"bar\"; }");
            assertTrue(false);
        } catch (CannotCompileException e) {}
        cc.writeFile();
        Object obj = make(cc.getName());
        assertEquals(1, invoke(obj, "run"));
    }

    // Issue #275
    public void testRedundantInsertAfter() throws Exception {
        CtClass cc = sloader.get(test5.InsertAfter.class.getName());
        CtMethod m = cc.getDeclaredMethod("foo");
        m.insertAfter("{ $_ += 1; }", false, true);
        CtMethod m2 = cc.getDeclaredMethod("bar");
        m2.insertAfter("{ $_ += 1; }", true, true);
        cc.writeFile();
        Object obj = make(cc.getName());
        assertEquals(71 + 22, invoke(obj, "run"));
    }

    // PR #294
    public void testEmptyArrayInit() throws Exception {
        CtClass cc = sloader.makeClass("test5.EmptyArrayInit");
        CtMethod m = CtNewMethod.make("public int[] foo(){ int[] a = {}; return a; }", cc);
        cc.addMethod(m);
        CtMethod m2 = CtNewMethod.make("public int[] bar(){ int[] a = new int[]{}; return a; }", cc);
        cc.addMethod(m2);
        CtMethod m3 = CtNewMethod.make("public String[] baz(){ String[] a = { null }; return a; }", cc);
        cc.addMethod(m3);
        CtMethod m0 = CtNewMethod.make("public int run() { return foo().length + bar().length + baz().length; }", cc);
        cc.addMethod(m0);
        cc.writeFile();
        Object obj = make(cc.getName());
        assertEquals(1, invoke(obj, "run"));
    }

    public void testTooManyConstPoolItems() throws Exception {
        CtClass cc = sloader.makeClass("TooManyConstPoolItems");
        ClassFile cf = cc.getClassFile();
        ConstPool cPool = cf.getConstPool();
        int size = cPool.getSize();
        while (cPool.getSize() < 65536 - 6)
            cPool.addIntegerInfo(cPool.getSize());

        cc.writeFile();
        cc.defrost();
        cPool.addIntegerInfo(-1);
        try {
            cc.writeFile();
            fail("too many items were accepted");
        }
        catch (CannotCompileException e) {}
    }

    public void testGithubIssue462Java21WithoutParameters() throws IOException {

        //This is a class file compiled by Java-21
        //javac Java21InnerClassWithoutParameters.java
        //public class Java21InnerClassWithoutParameters {
        //    class InnerClass implements Runnable {
        //        public void run() {
        //        }
        //    }
        //}
        String classFileName = "./Java21InnerClassWithoutParameters$InnerClass.class";
        ClassLoader classLoader = getClass().getClassLoader();
        File classFile = new File(classLoader.getResource(classFileName).getFile());
        
        CtClass cc = sloader.makeClass(new FileInputStream(classFile));
        cc.getClassFile().compact();

        ClassFile cf = cc.getClassFile2();
        ConstPool cp = cf.getConstPool();
        
        MethodInfo minfo = cf.getMethod("<init>");
        MethodParametersAttribute attr
                = (MethodParametersAttribute)minfo.getAttribute(MethodParametersAttribute.tag);
        assertEquals(1, attr.size());
        assertNull(attr.parameterName(0));
    }

    public void testSuperCall() throws Exception {
        String javacResult = new BearKeeper().javacResult();
        assertEquals("Man feed(Bear)", javacResult);

        CtClass cc = sloader.get("javassist.BearKeeper");
        CtMethod cm = CtMethod.make(
                "public String javassistResult() {return super.feed(new javassist.Bear());}",
                cc);
        cc.addMethod(cm);
        cc.setModifiers(Modifier.PUBLIC);
        cc.writeFile();
        Object obj = make(cc.getName());
        Method m = obj.getClass().getMethod("javassistResult");
        Object javassistResult = m.invoke(obj);

        //before this fix
        //expected:<Man feed(Bear)> but was:<Keeper feed(Animal)>
        assertEquals(javacResult, javassistResult);
    }
}