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that that encoded classes overrides equals(). Uncommenting either of immutable list member and "id" property': ; java -version java version "1.6.0-rc" Java(TM) SE Runtime Environment (build 1.6.0-rc-b100) Java HotSpot(TM) Server VM (build 1.6.0-rc-b100, mixed mode) ; javac TestListBean.java ; java TestListBean serialized: TestListBean$Stinky[name = cat, count = 9, tickets = [TestListBean$Ticket[number =1], TestListBean$Ticket[number =2]]] deserialized: TestListBean$Stinky[name = cat, count = 9, tickets = [TestListBean$Ticket[number =1], TestListBean$Ticket[number =2]]] encoded: TestListBean$Stinky[name = cat, count = 9, tickets = [TestListBean$Ticket[number =1], TestListBean$Ticket[number =2]]] java.lang.InstantiationException: java.util.Collections$UnmodifiableRandomAccessList Continuing ... java.lang.Exception: XMLEncoder: discarding statement XMLEncoder.writeObject(TestListBean$Stinky); Continuing ... Exception in thread "main" java.lang.ArrayIndexOutOfBoundsException: 0 at com.sun.beans.ObjectHandler.dequeueResult(ObjectHandler.java:139) at java.beans.XMLDecoder.readObject(XMLDecoder.java:201) at TestListBean.performBeanTest(TestListBean.java:98) at TestListBean.main(TestListBean.java:286) Bug 6505888, targeting 6u2, was fixed in build b01. The above test should work again as expected with to fix. I tested it on Java 5: ; java -version java version "1.5.0_11" Java(TM) 2 Runtime Environment, Standard Edition (build 1.5.0_11-b03) Java HotSpot(TM) Server VM (build 1.5.0_11-b03, mixed mode) ; javac TestListBean.java ; java TestListBean serialized: TestListBean$Stinky[name = cat, count = 9, tickets = [TestListBean$Ticket[number =1], TestListBean$Ticket[number =2]]] deserialized: TestListBean$Stinky[name = cat, count = 9, tickets = [TestListBean$Ticket[number =1], TestListBean$Ticket[number =2]]] encoded: TestListBean$Stinky[name = cat, count = 9, tickets = [TestListBean$Ticket[number =1], TestListBean$Ticket[number =2]]] decoded: TestListBean$Stinky[name = cat, count = 9, tickets = [TestListBean$Ticket[number =1], TestListBean$Ticket[number =2]]] On Java 6, this fails due to succeed: @Override public boolean equals(Object o) { if (o instanceof Ticket) { Ticket t = (Ticket)o; return (number == t.number); } return false; } or @Override public boolean equals(Object o) { if (o instanceof Stinky) { Stinky s = (Stinky)o; return ((name == null ? s.name == null : name.equals(s.name)) && (count == s.count) && tickets.equals(s.tickets)); } return false; } Of course it does not make sense is broken (and inconsistent with Java 5). Posted Date a 2007-04-05 07:57:45.0 : The attached TestListBean.java demonstrates the attached TestListBean.java causes the new problem: ; java -version java version "1.6.0_02" Java(TM) SE Runtime Environment (build 1.6.0_02-b01) Java HotSpot(TM) Server VM (build 1.6.0_01-b06, mixed mode) ; javac TestListBean.java ; java TestListBean serialized: TestListBean$Stinky[name = cat, count = 9, tickets = [TestListBean$Ticket[number =1], TestListBean$Ticket[number =2]]] deserialized: TestListBean$Stinky[name = cat, count = 9, tickets = [TestListBean$Ticket[number =1], TestListBean$Ticket[number =2]]] encoded: TestListBean$Stinky[name = cat, count = 9, tickets = [TestListBean$Ticket[number =1], TestListBean$Ticket[number =2]]] Exception in thread "main" java.lang.StackOverflowError at sun.reflect.GeneratedMethodAccessor1.invoke(Unknown Source) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25) at java.lang.reflect.Method.invoke(Method.java:597) at sun.reflect.misc.MethodUtil.invoke(MethodUtil.java:243) at java.beans.Statement.invoke(Statement.java:214) at java.beans.Expression.getValue(Expression.java:98) at java.beans.Encoder.getValue(Encoder.java:85) at java.beans.Encoder.get(Encoder.java:200) at java.beans.PersistenceDelegate.writeObject(PersistenceDelegate.java:94) ... repeated many times ... at java.beans.Encoder.writeObject(Encoder.java:54) at java.beans.XMLEncoder.writeObject(XMLEncoder.java:257) at java.beans.Encoder.writeExpression(Encoder.java:279) at java.beans.XMLEncoder.writeExpression(XMLEncoder.java:372) at java.beans.PersistenceDelegate.writeObject(PersistenceDelegate.java:97) ... repeated many times ... What's interesting is all classes to 6505888 'LTP: Java 6 breaks XML encoding/decoding on 6u2 obtained from /net/jano/export/disk29/jcg/NightlyBuilds/update.int/6u2/archived/2007-04-04.6u2 However, I saw the test succeeds if either of the test of the equals() methods in the problem: ; javac TestListBean.java ; java TestListBean The expected result is seen when running for override equals(), therefore such a hidden requirement
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