Hi,
I was trying to use BCEL to replace the initial value of static final fields of
existing classes. It seemed to work fine, but when the fields are referenced
from other classes they seem to contain the old values, eventhough the values
in the changed class itself are updated to the new value. Is there any way
using BCEL to change these constant values in that way? Maybe I'm not aware of
certain problems regarding the constant pool?
Here is what I did. Let's say, in a class named "Hello" I have a field like
this:
public static final String MESSAGE = "Hello";
Now I want to read in the class file and change the initial value:
ClassParser parser = new ClassParser("Hello.class");
JavaClass javaClass = parser.parse();
ClassGen cg = new ClassGen(javaClass);
ConstantPool cp = javaClass.getConstantPool();
ConstantPoolGen pg = new ConstantPoolGen(cp);
Field[] fields = classGen.getFields();
for (int i=0; i<fields.length; i++) {
if (fields[i].getName().equals("MESSAGE")) {
FieldGen fg = new FieldGen(ACC_PUBLIC | ACC_STATIC | ACC_FINAL, Type.STRING,
"MESSAGE", pg)
fg.setInitialValue("New Message");
cg.removeField(fields[i]);
cg.addField(fg.getFielD());
}
}
JavaClass changedClass = cg.getJavaClass();
changedClass.setConstantPool(pg.getFinalConstantPool());
changedClass.dump("Hello_.class");
Thanks
Matt
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