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ClassFileTransformer + Javassist: no such field


ClassFileTransformer + Javassist: no such field

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ClassFileTransformer + Javassist: no such field
Tag : java , By : KL.
Date : November 24 2020, 03:41 PM


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Improving field get and set performance with ASM or Javassist


Tag : java , By : Ansari
Date : March 29 2020, 07:55 AM
this will help ASM
Using ASMifierClassVisitor, you can see exactly what code you need to write to generate the inner classes:
ASMifierClassVisitor.main(new String[] { PurchaseOrder.customer_Field.class
    .getName() });
public static byte[] dump () throws Exception {

  ClassWriter cw = new ClassWriter(0);
  FieldVisitor fv;
  MethodVisitor mv;
  AnnotationVisitor av0;

  cw.visit(V1_6, ACC_SUPER, "inject/PurchaseOrder$customer_Field",
      "Ljava/lang/Object;"+
      "Linject/PropertyAccessor<Linject/PurchaseOrder;Linject/Customer;>;", 
      "java/lang/Object",
      new String[] { "inject/PropertyAccessor" });
//etc
{
mv = cw.visitMethod(ACC_STATIC + ACC_SYNTHETIC, "access$0", 
          "(Linject/PurchaseOrder;Linject/Customer;)V", null, null);
mv.visitCode();
mv.visitVarInsn(ALOAD, 0);
mv.visitVarInsn(ALOAD, 1);
mv.visitFieldInsn(PUTFIELD, "inject/PurchaseOrder",
          "customer", "Linject/Customer;");
mv.visitInsn(RETURN);
mv.visitMaxs(2, 2);
mv.visitEnd();
}
{
mv = cw.visitMethod(ACC_STATIC + ACC_SYNTHETIC, "access$1", 
          "(Linject/PurchaseOrder;)Linject/Customer;", null, null);
mv.visitCode();
mv.visitVarInsn(ALOAD, 0);
mv.visitFieldInsn(GETFIELD, "inject/PurchaseOrder", "
          customer", "Linject/Customer;");
mv.visitInsn(ARETURN);
mv.visitMaxs(1, 1);
mv.visitEnd();
}

No serializer found for class org.hibernate.proxy.pojo.javassist.Javassist?


Tag : json , By : alexmajy
Date : March 29 2020, 07:55 AM
To fix the issue you can do I had a similar problem with lazy loading via the hibernate proxy object. Got around it by annotating the class having lazy loaded private properties with:
@JsonIgnoreProperties({"hibernateLazyInitializer", "handler"})
Hibernate.initialize(<your getter method>);

Javassist: javassist.CannotCompileException: by java.lang.ClassFormatError: Duplicate method name&signature in class


Tag : java , By : tanminivan
Date : March 29 2020, 07:55 AM
hop of those help? I believe I found the reason.
Assuming that foobar.jar contains the class pk1.StringBuilder
java -cp javassist-3.7.ga.jar:foobar.jar:. JassistTiming 
java -cp javassist-3.7.ga.jar:foobar.jar:. JassistTiming 
java -cp javassist-3.7.ga.jar:.:foobar.jar JassistTiming 

ClassFileTransformer implementations with Javassist


Tag : java , By : Ambarish Singh
Date : March 29 2020, 07:55 AM
will be helpful for those in need All of the examples are wrong and will not work in a general setup. You should never use the default class pool and you should never - such as shown in the new relic blog - share a class pool between transformers as you cannot tell if loaded classes are related by their class loader.
Consider an application server where ever app has its own class loader; you could not even see the transformed classes using the default class pool (which references the system class loader, i.e. the class path) and you cannot promise that all apps on the app server run the same version of some class if they both contain them.
ClassPool classPool = new ClassPool();
classPool.appendClassPath(new LoaderClassPath(loader));
CtClass ctClass = classPool.makeClass(new ByteArrayInputStream(classfileBuffer));

javassist.NotFoundException error in Spring framework project using Javassist - Need help knowing how to set classpath a


Tag : java , By : Dennizzz
Date : March 29 2020, 07:55 AM
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