Dear all, I'm using javassist to generate access class for reflection, following this tutorial: http://www.ibm.com/developerworks/java/library/j-dyn0610/index.html?S_TAC... Everything works fine with my version, but it is not working with field without getter/setter. I need my generated access class to be able to access field directly in some case. So I wrote the following piece of code: | .... | protected static byte[] createAccess(final Class targetJavaClass, final String field, final String generatedClassName) | throws Exception { | | //... code to get read/write method | | String targetName = targetJavaClass.getName(); | ClassPool pool = ClassPool.getDefault(); | CtClass accessClass = pool.makeClass(generatedClassName); | CtClass targetClass = pool.get(targetName); | final CtClass ctFieldClass = pool.get("java.lang.Object"); | final CtClass[] ctFieldClassParam = new CtClass[]{ctFieldClass}; | CtMethod meth; | | // add target object field to class | accessClass.addField(new CtField(targetClass, "target", accessClass)); | | // add public default constructor method to class | CtConstructor cons = new CtConstructor(CT_NO_ARGS, accessClass); | cons.setBody(";"); | accessClass.addConstructor(cons); | | // add public <code>setTarget</code> method | meth = new CtMethod(CtClass.voidType, "setTarget", ctFieldClassParam, accessClass); | meth.setBody("target = (" + targetJavaClass.getName() + ") $1;"); | accessClass.addMethod(meth); | | | String src; | | // add public <code>setValue</code> method | meth = new CtMethod(CtClass.voidType, "setValue", ctFieldClassParam, accessClass); | final Class<?> fieldType = writer.getParameterTypes()[0]; | String cast$1 = "(" + fieldType.getName() + ") $1"; | if(directWriteField) src = "target." + field + " = " + " $1;"; | else src = "target." + writer.getName() + "(" + cast$1 + ");"; | meth.setBody(src); | accessClass.addMethod(meth); | | // add public <code>getValue</code> method | meth = new CtMethod(ctFieldClass, "getValue", CT_NO_ARGS, accessClass); | if(directReadField) src = field; | else src = reader.getName() + "()"; | meth.setBody("return (java.lang.Object) target." + src + ";"); | accessClass.addMethod(meth); | | // return binary representation of completed class | accessClass.addInterface(pool.get(IAccess.class.getName())); | accessClass.writeFile(); | return accessClass.toBytecode(); | } | ... | Execution of this code throws an exception after class generation, when calling newInstance on it: | java.lang.VerifyError: (class: Accessor$com/bnpparibas/eqd/fish/fwk/introspection/TestCachedIntrospectionInfo$SampleBean_secret, method: setValue signature: (Ljava/lang/Object;)V) Bad type in | putfield/putstatic | at java.lang.Class.getDeclaredConstructors0(Native Method) | at java.lang.Class.privateGetDeclaredConstructors(Class.java:2357) | at java.lang.Class.getConstructor0(Class.java:2671) | at java.lang.Class.newInstance0(Class.java:321) | at java.lang.Class.newInstance(Class.java:303) | The part of the code responsible of this is the following part of code: | f(directWriteField) src = "target." + field + " = " + " $1;"; | If I remove this line, there are no error. Here is the decompiled code of the faulty generated class: | package Accessor$com.bnpparibas.eqd.fish.fwk.introspection; | | import com.bnpparibas.eqd.fish.fwk.introspection.IAccess; | import com.bnpparibas.eqd.fish.fwk.introspection.SampleBean; | | public class SampleBean_directAccessField | implements IAccess { | | SampleBean target = null; | | public SampleBean_directAccessField() { | } | | public void setTarget(Object obj) { | target = (SampleBean)obj; | } | | public void setValue(Object obj) { | target.directAccessField = ((java.util.Date) (obj)); | } | | public Object getValue() { | return (Object)target.directAccessField; | } | } | And the directAccesField of the target object is a java.util.Date. I've spend to much time on this problem and I can't figure what the problem is. Thanks for any help you can provide. Regards. K. View the original post : http://www.jboss.org/index.html?module=bb&op=viewtopic&p=4222922#... Reply to the post : http://www.jboss.org/index.html?module=bb&op=posting&mode=reply&a...