Quarkus classLoader冲突
Quarkus classLoader冲突
提问于 2020-07-21 17:44:30
我在尝试构建我的quarkus应用程序时遇到了一个错误。这似乎与两个类加载器具有不同的javax/xml/namespace/QName类对象这一事实有关，正如在堆栈跟踪：Caused by: java.lang.LinkageError: loader constraint violation: when resolving field "DATETIME" the class loader (instance of io/quarkus/bootstrap/classloading/QuarkusClassLoader) of the referring class, javax/xml/datatype/DatatypeConstants, and the class loader (instance of <bootloader>) for the field's resolved type, javax/xml/namespace/QName, have different Class objects for that type中注意到的那样。但是我不知道到底发生了什么，也不知道如何解决它。
有谁能帮帮忙吗？
下面是完整的堆栈跟踪。
2020-07-21 11:25:18,432 ERROR [io.qua.run.boo.StartupActionImpl] (Quarkus Main Thread) Error running Quarkus: java.lang.reflect.InvocationTargetException
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:498)
at io.quarkus.runner.bootstrap.StartupActionImpl$3.run(StartupActionImpl.java:144)
at java.lang.Thread.run(Thread.java:748)
Caused by: java.lang.ExceptionInInitializerError
at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:62)
at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)
at java.lang.reflect.Constructor.newInstance(Constructor.java:423)
at java.lang.Class.newInstance(Class.java:442)
at io.quarkus.runtime.Quarkus.run(Quarkus.java:60)
at io.quarkus.runtime.Quarkus.run(Quarkus.java:38)
at io.quarkus.runtime.Quarkus.run(Quarkus.java:106)
at io.quarkus.runner.GeneratedMain.main(GeneratedMain.zig:29)
... 6 more
Caused by: java.lang.RuntimeException: Failed to start quarkus
at io.quarkus.runner.ApplicationImpl.<clinit>(ApplicationImpl.zig:190)
... 15 more
Caused by: java.lang.RuntimeException: Failed to initialize Arc
at io.quarkus.arc.Arc.initialize(Arc.java:26)
at io.quarkus.arc.runtime.ArcRecorder.getContainer(ArcRecorder.java:35)
at io.quarkus.deployment.steps.ArcProcessor$generateResources-1120260799.deploy_0(ArcProcessor$generateResources-1120260799.zig:72)
at io.quarkus.deployment.steps.ArcProcessor$generateResources-1120260799.deploy(ArcProcessor$generateResources-1120260799.zig:36)
at io.quarkus.runner.ApplicationImpl.<clinit>(ApplicationImpl.zig:149)
... 15 more
Caused by: java.lang.LinkageError: loader constraint violation: when resolving field "DATETIME" the class loader (instance of io/quarkus/bootstrap/classloading/QuarkusClassLoader) of the referring class, javax/xml/datatype/DatatypeConstants, and the class loader (instance of <bootloader>) for the field's resolved type, javax/xml/namespace/QName, have different Class objects for that type
at com.sun.xml.bind.v2.model.impl.RuntimeBuiltinLeafInfoImpl.<clinit>(RuntimeBuiltinLeafInfoImpl.java:254)
at com.sun.xml.bind.v2.model.impl.RuntimeTypeInfoSetImpl.<init>(RuntimeTypeInfoSetImpl.java:33)
at com.sun.xml.bind.v2.model.impl.RuntimeModelBuilder.createTypeInfoSet(RuntimeModelBuilder.java:98)
at com.sun.xml.bind.v2.model.impl.RuntimeModelBuilder.createTypeInfoSet(RuntimeModelBuilder.java:54)
at com.sun.xml.bind.v2.model.impl.ModelBuilder.<init>(ModelBuilder.java:132)
at com.sun.xml.bind.v2.model.impl.RuntimeModelBuilder.<init>(RuntimeModelBuilder.java:62)
at com.sun.xml.bind.v2.runtime.JAXBContextImpl.getTypeInfoSet(JAXBContextImpl.java:425)
at com.sun.xml.bind.v2.runtime.JAXBContextImpl.<init>(JAXBContextImpl.java:273)
at com.sun.xml.bind.v2.runtime.JAXBContextImpl.<init>(JAXBContextImpl.java:109)
at com.sun.xml.bind.v2.runtime.JAXBContextImpl$JAXBContextBuilder.build(JAXBContextImpl.java:1126)
at com.sun.xml.bind.v2.ContextFactory.createContext(ContextFactory.java:135)
at com.sun.xml.bind.v2.JAXBContextFactory.createContext(JAXBContextFactory.java:35)
at javax.xml.bind.ContextFinder.find(ContextFinder.java:393)
at javax.xml.bind.JAXBContext.newInstance(JAXBContext.java:691)
at javax.xml.bind.JAXBContext.newInstance(JAXBContext.java:632)
at com.examlpe.middleware.DistributedContextWrapper.<clinit>(DistributedContextWrapper.java:32)
at java.lang.Class.forName0(Native Method)
at java.lang.Class.forName(Class.java:348)
at com.exemple.quarkus.producers.RegisterProducers_ProducerMethod_distributedContextWrapperProducer_43b1afaa6d80f8d1886d6736d01bae86f45d5b94_Bean.<init>(RegisterProducers_ProducerMethod_distributedContextWrapperProducer_43b1afaa6d80f8d1886d6736d01bae86f45d5b94_Bean.zig:44)
at io.quarkus.arc.setup.Default_ComponentsProvider.addBeans2(Default_ComponentsProvider.zig:1115)
at io.quarkus.arc.setup.Default_ComponentsProvider.getComponents(Default_ComponentsProvider.zig:43)
at io.quarkus.arc.impl.ArcContainerImpl.<init>(ArcContainerImpl.java:106)
at io.quarkus.arc.Arc.initialize(Arc.java:20)
... 19 more
2020-07-21 11:25:18,433 ERROR [io.qua.dep.dev.DevModeMain] (main) Failed to start Quarkus: java.lang.RuntimeException: java.lang.RuntimeException: Failed to initialize Arc
at io.quarkus.dev.appstate.ApplicationStateNotification.waitForApplicationStart(ApplicationStateNotification.java:51)
at io.quarkus.runner.bootstrap.StartupActionImpl.runMainClass(StartupActionImpl.java:155)
at io.quarkus.deployment.dev.IsolatedDevModeMain.firstStart(IsolatedDevModeMain.java:95)
at io.quarkus.deployment.dev.IsolatedDevModeMain.accept(IsolatedDevModeMain.java:301)
at io.quarkus.deployment.dev.IsolatedDevModeMain.accept(IsolatedDevModeMain.java:42)
at io.quarkus.bootstrap.app.CuratedApplication.runInCl(CuratedApplication.java:131)
at io.quarkus.bootstrap.app.CuratedApplication.runInAugmentClassLoader(CuratedApplication.java:84)
at io.quarkus.deployment.dev.DevModeMain.start(DevModeMain.java:126)
at io.quarkus.deployment.dev.DevModeMain.main(DevModeMain.java:56)
Caused by: java.lang.RuntimeException: Failed to initialize Arc
at io.quarkus.arc.Arc.initialize(Arc.java:26)
at io.quarkus.arc.runtime.ArcRecorder.getContainer(ArcRecorder.java:35)
at io.quarkus.deployment.steps.ArcProcessor$generateResources-1120260799.deploy_0(ArcProcessor$generateResources-1120260799.zig:72)
at io.quarkus.deployment.steps.ArcProcessor$generateResources-1120260799.deploy(ArcProcessor$generateResources-1120260799.zig:36)回答 3
Stack Overflow用户
回答已采纳
发布于 2020-07-23 19:41:27
在使用maven依赖关系树工具进一步研究我的依赖关系之后，我发现这个问题是由stax-api依赖关系引起的。此依赖项被临时包含在我的项目中。从那时起，很难解决这个问题，因为它没有直接包含在我的pom中，因此看不见。我所做的只是从我的pom中排除了stax-api依赖，这就解决了问题。
最后，依赖关系将如下所示：
<dependency>
<groupId>com.example.lib</groupId>
<artifactId>my-lib</artifactId>
<version>${example-lib-version}</version>
<exclusions>
<exclusion>
<groupId>stax</groupId>
<artifactId>stax-api</artifactId>
</exclusion>
</exclusions>
</dependency>使用com.example.lib:my-lib包含stax api的依赖项。
Stack Overflow用户
发布于 2021-05-21 15:04:37
此问题实际上是由于javax.xml.namespace.QName是从QuarkusClassLoader/RunnerClassLoader加载的(因为默认情况下Quarkus将首先尝试从QuarkusClassLoader/RunnerClassLoader加载类)，而在该特定情况下，它应该从系统ClassLoader加载。
要解决此问题，您确实可以排除导致LinkageError的依赖项，如果您可以排除此依赖项的所有类，否则您可以依靠属性quarkus.class-loading.parent-first指示Quarkus，在尝试从QuarkusClassLoader/RunnerClassLoader加载它之前，需要首先从父Quarkus加载它的类。
在application.properties中使用quarkus.class-loading.parent-first的示例：
quarkus.class-loading.parent-first-artifacts=stax:stax-apiStack Overflow用户
发布于 2021-11-03 07:56:33
我在使用javax.transaction.xa.XAResource时也遇到了类似的问题。问题是，包含在JVM和外部依赖项(拆分包)中的类总是由不同的类加载器加载(对于开发模式或quarkus测试)，请参阅https://quarkus.io/guides/class-loading-reference。通过删除那些拆分的包(通过上面提到的排除)，问题就解决了。据我所知，这个问题不会出现在生产环境中，因为那里有“扁平的类路径”。
页面原文内容由Stack Overflow提供。腾讯云小微IT领域专用引擎提供翻译支持
原文链接：
https://stackoverflow.com/questions/63011722
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