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POXML.loadString in WebSphere throws java.lang.VerifyError
 

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    <p>I'm calling <code>XML.loadString(...)</code> in a MDB in WebSphere 6.1 ND. I'm getting <code>java.lang.VerifyError</code>, similar to that described in <a href="https://stackoverflow.com/questions/2861807/was-6-1-java-lang-verifyerror-class-loading-constraint-violated">this question</a>.</p> <p>The stacktrace is:</p> <pre><code>java.lang.VerifyError: class loading constraint violated (class: scala/collection/mutable/StringBuilder method: toSeq()Lscala/collection/Seq;) at pc: 0 at java.lang.J9VMInternals.verifyImpl(Native Method) at java.lang.J9VMInternals.verify(J9VMInternals.java:59) at java.lang.J9VMInternals.initialize(J9VMInternals.java:120) at scala.xml.parsing.FactoryAdapter.&lt;init&gt;(FactoryAdapter.scala:40) at scala.xml.parsing.NoBindingFactoryAdapter.&lt;init&gt;(NoBindingFactoryAdapter.scala:18) at scala.xml.factory.XMLLoader$class.adapter(XMLLoader.scala:24) at scala.xml.XML$.adapter(XML.scala:40) at scala.xml.factory.XMLLoader$class.loadXML(XMLLoader.scala:37) at scala.xml.XML$.loadXML(XML.scala:40) at scala.xml.factory.XMLLoader$class.loadString(XMLLoader.scala:59) at scala.xml.XML$.loadString(XML.scala:40) at my code </code></pre> <p>It happens if I use <code>ConstructingParser</code> too:</p> <pre><code>java.lang.VerifyError: class loading constraint violated (class: scala/collection/mutable/StringBuilder method: toSeq()Lscala/collection/Seq;) at pc: 0 at java.lang.J9VMInternals.verifyImpl(Native Method) at java.lang.J9VMInternals.verify(J9VMInternals.java:59) at java.lang.J9VMInternals.initialize(J9VMInternals.java:120) at scala.xml.parsing.MarkupParser$class.$init$(MarkupParser.scala:102) at scala.xml.parsing.ConstructingParser.&lt;init&gt;(ConstructingParser.scala:47) at scala.xml.parsing.ConstructingParser$.fromSource(ConstructingParser.scala:22) </code></pre> <p>I'm using Scala v2.9.0.1</p> <p>How can I diagnose this class linkage problem?</p> <p><strong>Edit #1</strong></p> <p>On some reflection I realised that the problem occured after an unrelated change. On a hunch I fully uninstalled the application from WAS and then reinstalled it. The problem was gone. The problem recurred after the next application <em>update</em> (i.e. overwrite).</p> <p>After several more hours, and other changes unlreated to Scala XML parsing, I forgot to uninstall/reinstall and did an update instead. The problem did not recur. I can no longer replicate the issue.</p> <p><strong>Edit #2</strong></p> <p>The problem came back and can not be solved with uninstall/reinstall alone. Retried with Scala 2.8.1, but the problem persists. Will now try uninstall/turn off server/delete temp files/reinstall/restart server. Wish me luck.</p>
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    1. COThis might be a bug. I'll try with Scala 2.8.1. If it works there, please open an issue on [JIRA](https://issues.scala-lang.org/secure/Dashboard.jspa).
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    2. COProblem still occurs with 2.8.1.
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