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How can get the initial member field value?
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reply from <a href="http://community.jboss.org/people/swd847">Stuart Douglas</a> in <i>Javassist</i> - <a href="http://community.jboss.org/message/546350#546350">View the full discussion</a>
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<div class="jive-rendered-content"><p>This stuff is set in the constructor, so some of it can be extracted, probably not it the format you want though.</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>For integer fields the bytecode code that gets generated would look something like:</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>ALOAD_0 //put the this pointer on the stack</p><p>ICONST_2 //put the integer constant 2 on the stack</p><p>PUTFIELD com/mydomain/Point.x //set the field value.</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>The hashmap field would be slightly more complex:</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>ALOAD_0 //put the this pointer on the stack</p><p>ANEW java/util/HashMap //create the hashmap instance</p><p>DUP //duplicate it so it is still on the stack after the constructor call</p><p>INVOKESPECIAL java/util/HashMap.<init> //call the constructor</p><p>PUTFIELD com/mydomain/Point.hashMap //set the field value.</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>To actually extract this information you would need to write some kind of bytecode analyser, and even then there would be cases that it could not handle correctly, as you would also need some kind of dissasembler to go back from the bytecode into java.</p></div>
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