linkageError：覆盖方法违反方法Javax/xml/stream/xmlinputfactory.createxmleventreader

Question

我正在升级一个在WebSphere 9运行IBM JDK 8上托管的应用程序，从春季4.0.3到5.3.18。在此过程中，我将项目的Jackson，Woodstox和Stax2依赖项更新为最新版本。该应用程序构建，但是在将XML字符串转换为JSON时，在启动时发生了此错误：

java.lang.LinkageError: loading constraint violation when overriding method "javax/xml/stream/XMLInputFactory.createXMLEventReader(Ljavax/xml/transform/Source;)Ljavax/xml/stream/XMLEventReader;" during creation of class "com/ctc/wstx/stax/WstxInputFactory": loader "com/ibm/ws/classloader/CompoundClassLoader@c586bf67" of class "com/ctc/wstx/stax/WstxInputFactory" and loader "com/ibm/oti/vm/BootstrapClassLoader@8a89d546" of class "javax/xml/stream/XMLInputFactory" have different types for the method signature
at java.lang.ClassLoader.defineClassImpl(Native Method) ~[?:2.9 (11-06-2019)]
at java.lang.ClassLoader.defineClassInternal(ClassLoader.java:397) ~[?:2.9 (11-06-2019)]
at java.lang.ClassLoader.defineClass(ClassLoader.java:358) ~[?:2.9 (11-06-2019)]
at java.security.SecureClassLoader.defineClass(SecureClassLoader.java:154) ~[?:1.8.0]
at com.ibm.ws.classloader.CompoundClassLoader._defineClass(CompoundClassLoader.java:876) ~[com.ibm.ws.runtime.jar:WAS90.SERV1 [f5021945.01]]
at com.ibm.ws.classloader.CompoundClassLoader.localFindClass(CompoundClassLoader.java:754) ~[com.ibm.ws.runtime.jar:WAS90.SERV1 [f5021945.01]]
at com.ibm.ws.classloader.CompoundClassLoader.loadClass(CompoundClassLoader.java:622) ~[com.ibm.ws.runtime.jar:WAS90.SERV1 [f5021945.01]]
at java.lang.ClassLoader.loadClass(ClassLoader.java:871) ~[?:2.9 (11-06-2019)]
at java.lang.Class.forNameImpl(Native Method) ~[?:2.9 (11-06-2019)]
at java.lang.Class.forName(Class.java:403) ~[?:2.9 (11-06-2019)]
at java.util.ServiceLoader$LazyIterator.nextService(ServiceLoader.java:381) ~[?:1.8.0]
at java.util.ServiceLoader$LazyIterator.next(ServiceLoader.java:415) ~[?:1.8.0]
at java.util.ServiceLoader$1.next(ServiceLoader.java:491) ~[?:1.8.0]
at javax.xml.stream.FactoryFinder.findServiceProvider(Unknown Source) ~[?:?]
at javax.xml.stream.FactoryFinder.find(Unknown Source) ~[?:?]
at javax.xml.stream.XMLInputFactory.newFactory(Unknown Source) ~[?:?]
at com.fasterxml.jackson.dataformat.xml.XmlFactory.<init>(XmlFactory.java:115) ~[jackson-dataformat-xml-2.13.2.jar:2.13.2]
at com.fasterxml.jackson.dataformat.xml.XmlFactory.<init>(XmlFactory.java:101) ~[jackson-dataformat-xml-2.13.2.jar:2.13.2]
at com.fasterxml.jackson.dataformat.xml.XmlFactory.<init>(XmlFactory.java:85) ~[jackson-dataformat-xml-2.13.2.jar:2.13.2]
at com.fasterxml.jackson.dataformat.xml.XmlMapper.<init>(XmlMapper.java:127) ~[jackson-dataformat-xml-2.13.2.jar:2.13.2]

我不了解此错误的原因。早些时候，在升级中，我遇到了不同的LinkageErrors，这些链接通过删除了杰克逊（JSR173_API，Stax-API和WSTX-ASL）不再使用的依赖项来解决，但我无法解决这一问题。

Answer 1

我遇到了同一问题，并以以下方式解决了它，错误显示了重复的“ XMlinput -factory”类，可能会出现在应用程序的不同依赖项中，包括依赖关系或服务器依赖项或两者。

如果可能的话，如果不可能，请从应用程序中删除重复依赖项，至少要制作具有“ XMlinput -factory”类的依赖项范围。