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https://issues.apache.org/jira/browse/MNG-7111?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17354028#comment-17354028
]
Hudson commented on MNG-7111:
-----------------------------
Build succeeded in Jenkins: Maven » Maven TLP » maven » checkstyle-next #12
See
https://ci-builds.apache.org/job/Maven/job/maven-box/job/maven/job/checkstyle-next/12/
> Deadlock when reading pom
> -------------------------
>
> Key: MNG-7111
> URL: https://issues.apache.org/jira/browse/MNG-7111
> Project: Maven
> Issue Type: Task
> Reporter: Guillaume Nodet
> Assignee: Robert Scholte
> Priority: Major
> Fix For: 4.0.0, 4.0.0-alpha-1
>
>
> I'm running into the following deadlock while building Apache Camel with the
> current master:
> {code}
> "TransformThread-16@4333" daemon prio=5 tid=0x20 nid=NA waiting
> java.lang.Thread.State: WAITING
> blocks TransformThread-17@4342
> at java.lang.Object.wait(Object.java:-1)
> at java.io.PipedInputStream.read(PipedInputStream.java:326)
> at java.io.PipedInputStream.read(PipedInputStream.java:377)
> at java.io.FilterInputStream.read(FilterInputStream.java:133)
> at java.io.BufferedInputStream.fill(BufferedInputStream.java:252)
> at java.io.BufferedInputStream.read(BufferedInputStream.java:271)
> - locked <0x1163> (a java.io.BufferedInputStream)
> at
> org.codehaus.plexus.util.xml.XmlReader.getBOMEncoding(XmlReader.java:620)
> at
> org.codehaus.plexus.util.xml.XmlReader.doRawStream(XmlReader.java:440)
> at org.codehaus.plexus.util.xml.XmlReader.<init>(XmlReader.java:178)
> at org.codehaus.plexus.util.xml.XmlReader.<init>(XmlReader.java:145)
> at
> org.codehaus.plexus.util.xml.XmlStreamReader.<init>(XmlStreamReader.java:84)
> at
> org.codehaus.plexus.util.ReaderFactory.newXmlReader(ReaderFactory.java:109)
> at
> org.apache.maven.model.io.DefaultModelReader.read(DefaultModelReader.java:116)
> at
> org.apache.maven.model.io.DefaultModelReader.read(DefaultModelReader.java:90)
> at
> org.apache.maven.model.building.DefaultModelProcessor.read(DefaultModelProcessor.java:97)
> at
> org.apache.maven.model.building.DefaultModelBuilder.readRawModel(DefaultModelBuilder.java:736)
> at
> org.apache.maven.model.building.DefaultModelBuilder.access$200(DefaultModelBuilder.java:99)
> at
> org.apache.maven.model.building.DefaultModelBuilder$DefaultTransformerContextBuilder$1.findRawModel(DefaultModelBuilder.java:1588)
> at
> org.apache.maven.model.building.DefaultModelBuilder$DefaultTransformerContextBuilder$1.lambda$getRawModel$1(DefaultModelBuilder.java:1570)
> at
> org.apache.maven.model.building.DefaultModelBuilder$DefaultTransformerContextBuilder$1$$Lambda$129.1344264523.apply(Unknown
> Source:-1)
> at
> java.util.concurrent.ConcurrentHashMap.computeIfAbsent(ConcurrentHashMap.java:1705)
> - locked <0x115e> (a
> java.util.concurrent.ConcurrentHashMap$ReservationNode)
> at
> org.apache.maven.model.building.DefaultModelBuilder$DefaultTransformerContextBuilder$1.getRawModel(DefaultModelBuilder.java:1569)
> at
> org.apache.maven.model.building.DefaultBuildPomXMLFilterFactory.lambda$getDependencyKeyToVersionMapper$3(DefaultBuildPomXMLFilterFactory.java:67)
> at
> org.apache.maven.model.building.DefaultBuildPomXMLFilterFactory$$Lambda$87.1867108691.apply(Unknown
> Source:-1)
> at
> org.apache.maven.xml.sax.filter.ReactorDependencyXMLFilter.getVersion(ReactorDependencyXMLFilter.java:156)
> at
> org.apache.maven.xml.sax.filter.ReactorDependencyXMLFilter.endElement(ReactorDependencyXMLFilter.java:112)
> at
> org.xml.sax.helpers.XMLFilterImpl.endElement(XMLFilterImpl.java:570)
> at
> com.sun.org.apache.xerces.internal.parsers.AbstractSAXParser.endElement(AbstractSAXParser.java:610)
> at
> com.sun.org.apache.xerces.internal.impl.XMLDocumentFragmentScannerImpl.scanEndElement(XMLDocumentFragmentScannerImpl.java:1718)
> at
> com.sun.org.apache.xerces.internal.impl.XMLDocumentFragmentScannerImpl$FragmentContentDriver.next(XMLDocumentFragmentScannerImpl.java:2883)
> at
> com.sun.org.apache.xerces.internal.impl.XMLDocumentScannerImpl.next(XMLDocumentScannerImpl.java:605)
> at
> com.sun.org.apache.xerces.internal.impl.XMLNSDocumentScannerImpl.next(XMLNSDocumentScannerImpl.java:112)
> at
> com.sun.org.apache.xerces.internal.impl.XMLDocumentFragmentScannerImpl.scanDocument(XMLDocumentFragmentScannerImpl.java:534)
> at
> com.sun.org.apache.xerces.internal.parsers.XML11Configuration.parse(XML11Configuration.java:888)
> at
> com.sun.org.apache.xerces.internal.parsers.XML11Configuration.parse(XML11Configuration.java:824)
> at
> com.sun.org.apache.xerces.internal.parsers.XMLParser.parse(XMLParser.java:141)
> at
> com.sun.org.apache.xerces.internal.parsers.AbstractSAXParser.parse(AbstractSAXParser.java:1216)
> at org.xml.sax.helpers.XMLFilterImpl.parse(XMLFilterImpl.java:357)
> at org.xml.sax.helpers.XMLFilterImpl.parse(XMLFilterImpl.java:357)
> at org.xml.sax.helpers.XMLFilterImpl.parse(XMLFilterImpl.java:357)
> at org.xml.sax.helpers.XMLFilterImpl.parse(XMLFilterImpl.java:357)
> at
> com.sun.org.apache.xalan.internal.xsltc.trax.TransformerImpl.transformIdentity(TransformerImpl.java:687)
> at
> com.sun.org.apache.xalan.internal.xsltc.trax.TransformerImpl.transform(TransformerImpl.java:774)
> at
> com.sun.org.apache.xalan.internal.xsltc.trax.TransformerImpl.transform(TransformerImpl.java:370)
> at
> org.apache.maven.model.building.AbstractModelSourceTransformer.lambda$transform$1(AbstractModelSourceTransformer.java:157)
> at
> org.apache.maven.model.building.AbstractModelSourceTransformer$$Lambda$94.1778994610.run(Unknown
> Source:-1)
> at java.lang.Thread.run(Thread.java:834)
> "TransformThread-17@4342" daemon prio=5 tid=0x21 nid=NA waiting for monitor
> entry
> java.lang.Thread.State: BLOCKED
> waiting for TransformThread-16@4333 to release lock on <0x115e> (a
> java.util.concurrent.ConcurrentHashMap$ReservationNode)
> at
> java.util.concurrent.ConcurrentHashMap.transfer(ConcurrentHashMap.java:2477)
> at
> java.util.concurrent.ConcurrentHashMap.addCount(ConcurrentHashMap.java:2348)
> at
> java.util.concurrent.ConcurrentHashMap.computeIfAbsent(ConcurrentHashMap.java:1773)
> at
> org.apache.maven.model.building.DefaultModelBuilder$DefaultTransformerContextBuilder$1.getRawModel(DefaultModelBuilder.java:1569)
> at
> org.apache.maven.model.building.DefaultBuildPomXMLFilterFactory.lambda$getDependencyKeyToVersionMapper$3(DefaultBuildPomXMLFilterFactory.java:67)
> at
> org.apache.maven.model.building.DefaultBuildPomXMLFilterFactory$$Lambda$87.1867108691.apply(Unknown
> Source:-1)
> at
> org.apache.maven.xml.sax.filter.ReactorDependencyXMLFilter.getVersion(ReactorDependencyXMLFilter.java:156)
> at
> org.apache.maven.xml.sax.filter.ReactorDependencyXMLFilter.endElement(ReactorDependencyXMLFilter.java:112)
> at
> org.xml.sax.helpers.XMLFilterImpl.endElement(XMLFilterImpl.java:570)
> at
> com.sun.org.apache.xerces.internal.parsers.AbstractSAXParser.endElement(AbstractSAXParser.java:610)
> at
> com.sun.org.apache.xerces.internal.impl.XMLDocumentFragmentScannerImpl.scanEndElement(XMLDocumentFragmentScannerImpl.java:1718)
> at
> com.sun.org.apache.xerces.internal.impl.XMLDocumentFragmentScannerImpl$FragmentContentDriver.next(XMLDocumentFragmentScannerImpl.java:2883)
> at
> com.sun.org.apache.xerces.internal.impl.XMLDocumentScannerImpl.next(XMLDocumentScannerImpl.java:605)
> at
> com.sun.org.apache.xerces.internal.impl.XMLNSDocumentScannerImpl.next(XMLNSDocumentScannerImpl.java:112)
> at
> com.sun.org.apache.xerces.internal.impl.XMLDocumentFragmentScannerImpl.scanDocument(XMLDocumentFragmentScannerImpl.java:534)
> at
> com.sun.org.apache.xerces.internal.parsers.XML11Configuration.parse(XML11Configuration.java:888)
> at
> com.sun.org.apache.xerces.internal.parsers.XML11Configuration.parse(XML11Configuration.java:824)
> at
> com.sun.org.apache.xerces.internal.parsers.XMLParser.parse(XMLParser.java:141)
> at
> com.sun.org.apache.xerces.internal.parsers.AbstractSAXParser.parse(AbstractSAXParser.java:1216)
> at org.xml.sax.helpers.XMLFilterImpl.parse(XMLFilterImpl.java:357)
> at org.xml.sax.helpers.XMLFilterImpl.parse(XMLFilterImpl.java:357)
> at org.xml.sax.helpers.XMLFilterImpl.parse(XMLFilterImpl.java:357)
> at org.xml.sax.helpers.XMLFilterImpl.parse(XMLFilterImpl.java:357)
> at
> com.sun.org.apache.xalan.internal.xsltc.trax.TransformerImpl.transformIdentity(TransformerImpl.java:687)
> at
> com.sun.org.apache.xalan.internal.xsltc.trax.TransformerImpl.transform(TransformerImpl.java:774)
> at
> com.sun.org.apache.xalan.internal.xsltc.trax.TransformerImpl.transform(TransformerImpl.java:370)
> at
> org.apache.maven.model.building.AbstractModelSourceTransformer.lambda$transform$1(AbstractModelSourceTransformer.java:157)
> at
> org.apache.maven.model.building.AbstractModelSourceTransformer$$Lambda$94.1778994610.run(Unknown
> Source:-1)
> at java.lang.Thread.run(Thread.java:834)
> {code}
> The problem is that there's a misuse of {{computeIfAbsent}}. The javadoc
> indicates that the mapping function should not attempt to modify the map,
> which is exactly what we're doing in this case.
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