Apache Byte Code Engineering Library, an open-source library for inspecting and manipulating Java byte code files (.class files)
For details see: http://jakarta.apache.org/bcel/
Questions tagged [bcel]
123 questions
4
votes
1 answer
Adding a field to Java class
Looked at using CGLib, ASM, BCEL (aspect) and Javassist to add a field to a class during runtime....
Just to get my head straight it looks like these bytecode manipulators don't update the actual class rather allow the user to only dump the…
Matthew Campbell
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3
votes
3 answers
Dynamically editing/creating classes in Java Android
I am looking for a way to dynamically define classes and instantiate them in Android, at runtime. From my understanding, this is already done in Android, I just need some help figuring it out.
I can a similiar result in Javascript and PHP. I know…
Jonathan
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3
votes
1 answer
How to get class Constructor parameteres using Apache BCEL?
I 'm able to get methods using BCEL but is it possible to get constructors of a class using the same library?
Feras Odeh
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3
votes
1 answer
How to push integer on Stack in BCEL
I am facing a problem in context of pushing a integer on stack in BCEL.
I have a method _square of someClass i.e. "mathClass"
ilist = new InstructionList();
ilist.append(InstructionConstants.ALOAD_0);
ilist.append(new…
zaree
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3
votes
1 answer
After update to Java8, getting error during JiBX bind - [bind] java.lang.IllegalStateException: Error loading class java.lang.CharSequence
On my machine, I updated from Java 1.6 to Java 1.8.
Now, while doing build getting below JiBXException in JiBX binding compilation.
bind:
[echo] Running JiBX binding compiler
[bind] Error running binding compiler
[bind]…
Jatin Gupta
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3
votes
5 answers
Is BCEL == monkeypatching for java?
a colleague pointed me the other day to BCEL which , as best I can tell from his explanation and a quick read, a way to modify at run time the byte code. My first thought was that it sounded dangerous, and my second thought was that it sounded…
shsteimer
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3
votes
3 answers
How to get bytecode of cglib proxy class instance?
I'm trying to get bytecode of cglib enhanced object this way using BCEL:
package app;
import cglib.MyInterceptor;
import net.sf.cglib.proxy.Enhancer;
import org.apache.bcel.Repository;
import org.apache.bcel.classfile.JavaClass;
import…
corvax
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3
votes
0 answers
Replacing a class with BCEL
I'm writing some code where I want to use BCEL to substitute all calls to methods of SomeClass with calls to methods of SomeOtherClass.
Right now, from my understanding, I can do this by:
iterating over the instruction list
finding all…
Gian Luca Scoccia
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2
votes
2 answers
How to verify Java Bytecode before injecting into the JVM?
I'm trying to verify "on the fly" generated bytecode!
I already had several attempts, one attempt was to compile my classes in runtime with the eclipse compiler another was to compile from memory as mentioned here:
Compile From Memory
First results…
Evils
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2
votes
5 answers
Is it possible to store a byte array(raw data) in a java class file?
I'm using Apache BCEL to dynamically create java classes that will each have its own associated image. These generated class implement the following interface:
interface ImageOwner {
byte[] getImage();
}
When dynamically implementing the…
Thiago Padilha
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2
votes
1 answer
Can we push a Custom Type Object on Stack Operand in BCEL?
In BCEL we can push primitive types on Operand Stack. BUT now I want to know if it is possible to push a Custom Type Object on Stack in BCEL?
I am giving some code so that it can explain the Problem Context
class Automobile {
public void…
zaree
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2
votes
1 answer
extract variable names using BCEL library
hi i am using bcel library to read byte code. I needed to extract the variables names.
Any idea how to do it?
Firestarter
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2
votes
1 answer
Renaming Things
How do I rename things using BCEL? So far what I do is go through each method in a class and create a new NameAndType constant in the constant pool, then I replace the old NameAndType constant with that one
int nameRef = cpg.addNameAndType(newName,…
Contra
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2
votes
1 answer
Determining the Efferent coupling between objects (CBO Metric) using the parsed byte-code generated by BCEL
I have built a program, which takes in a provided ".class" file and parses it using the BCEL, I've learnt how to calculate the LCOM4 value now. Now I would like to know how to calculate the CBO(Coupling between object) value of the class file. I've…
Shehanka Fernando
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2
votes
1 answer
Illegal constant pool index for method signature when creating a simple class file
I want to create a simple compiler which generates Java Bytecode. For generating the code I am using the Apache BCEL library.
However, I failed in creating a simple class with a main method that does nothing. I use the following code (I know that it…
Lukas
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