我们使用 hibernate validator 并在项目中动态加载类(通过将类加载到单独的类加载器中)。在意识到不需要该类之后，我们删除对该类和类加载器的所有引用，然后GC收集该引用。
我们得到的是:应用程序启动后一段时间，Java反射停止工作。
java.lang.reflect.UndeclaredThrowableException: null
at com.sun.proxy.$Proxy253.equals(Unknown Source)
at org.hibernate.validator.internal.engine.constraintvalidation.ConstraintValidatorManager$CacheKey.equals(ConstraintValidatorManager.java:287)
at java.util.concurrent.ConcurrentHashMap.get(ConcurrentHashMap.java:940)
at org.hibernate.validator.internal.engine.constraintvalidation.ConstraintValidatorManager.getInitializedValidator(ConstraintValidatorManager.java:104)
at org.hibernate.validator.internal.engine.constraintvalidation.ConstraintTree.getConstraintValidatorNoUnwrapping(ConstraintTree.java:301)
at org.hibernate.validator.internal.engine.constraintvalidation.ConstraintTree.getConstraintValidatorInstanceForAutomaticUnwrapping(ConstraintTree.java:242)
at org.hibernate.validator.internal.engine.constraintvalidation.ConstraintTree.getInitializedConstraintValidator(ConstraintTree.java:163)
at org.hibernate.validator.internal.engine.constraintvalidation.ConstraintTree.validateConstraints(ConstraintTree.java:116)
at org.hibernate.validator.internal.engine.constraintvalidation.ConstraintTree.validateComposingConstraints(ConstraintTree.java:396)
at org.hibernate.validator.internal.engine.constraintvalidation.ConstraintTree.validateConstraints(ConstraintTree.java:98)
at org.hibernate.validator.internal.engine.constraintvalidation.ConstraintTree.validateConstraints(ConstraintTree.java:87)
at org.hibernate.validator.internal.metadata.core.MetaConstraint.validateConstraint(MetaConstraint.java:73)
at org.hibernate.validator.internal.engine.ValidatorImpl.validateMetaConstraint(ValidatorImpl.java:616)
at org.hibernate.validator.internal.engine.ValidatorImpl.validateConstraint(ValidatorImpl.java:581)
at org.hibernate.validator.internal.engine.ValidatorImpl.validateConstraintsForSingleDefaultGroupElement(ValidatorImpl.java:527)
at org.hibernate.validator.internal.engine.ValidatorImpl.validateConstraintsForDefaultGroup(ValidatorImpl.java:495)
at org.hibernate.validator.internal.engine.ValidatorImpl.validateConstraintsForCurrentGroup(ValidatorImpl.java:460)
at org.hibernate.validator.internal.engine.ValidatorImpl.validateInContext(ValidatorImpl.java:410)
at org.hibernate.validator.internal.engine.ValidatorImpl.validate(ValidatorImpl.java:207)
at org.springframework.validation.beanvalidation.SpringValidatorAdapter.validate(SpringValidatorAdapter.java:281)
... Many spring filters calls ...
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
at org.springframework.web.multipart.support.MultipartFilter.doFilterInternal(MultipartFilter.java:122)
at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107)
at org.springframework.web.filter.DelegatingFilterProxy.invokeDelegate(DelegatingFilterProxy.java:346)
at org.springframework.web.filter.DelegatingFilterProxy.doFilter(DelegatingFilterProxy.java:262)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
at *someAwesomePackage*.microservice.rest.spring.webapp.CabinetRequestFilter.doFilterInternal(CabinetRequestFilter.java:98)
at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107)
at org.springframework.web.filter.DelegatingFilterProxy.invokeDelegate(DelegatingFilterProxy.java:346)
at org.springframework.web.filter.DelegatingFilterProxy.doFilter(DelegatingFilterProxy.java:262)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:198)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:96)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:140)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:81)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:87)
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:342)
at org.apache.coyote.http11.Http11Processor.service(Http11Processor.java:803)
at org.apache.coyote.AbstractProcessorLight.process(AbstractProcessorLight.java:66)
at org.apache.coyote.AbstractProtocol$ConnectionHandler.process(AbstractProtocol.java:790)
at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1459)
at org.apache.tomcat.util.net.SocketProcessorBase.run(SocketProcessorBase.java:49)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)
at java.lang.Thread.run(Thread.java:748)
Caused by: java.lang.reflect.InvocationTargetException: null
at sun.reflect.GeneratedMethodAccessor268.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:498)
at org.hibernate.validator.internal.util.annotationfactory.AnnotationProxy.invoke(AnnotationProxy.java:69)
... 260 common frames omitted
Caused by: java.lang.NullPointerException: null
at org.hibernate.validator.internal.util.annotationfactory.AnnotationProxy.getAnnotationMemberValue(AnnotationProxy.java:248)
at org.hibernate.validator.internal.util.annotationfactory.AnnotationProxy.equals(AnnotationProxy.java:104)
... 264 common frames omitted
在此位置发生错误(来自java.lang.Class.java的方法):
private static Method searchMethods(Method[] methods,
String name,
Class<?>[] parameterTypes) {
Method res = null;
String internedName = name.intern();
for (int i = 0; i < methods.length; i++) {
Method m = methods[i];
if (m.getName() == internedName
&& arrayContentsEq(parameterTypes, m.getParameterTypes())
&& (res == null
|| res.getReturnType().isAssignableFrom(m.getReturnType())))
res = m;
}
return (res == null ? res : getReflectionFactory().copyMethod(res));
}
类具有方法，但是
m.getName () == internedName的比较为false。比较未返回，因为方法的名称没有被插入。
如果我从debug调用
m.getName (). Intern () == internedName，它将返回true。但是方法“searchMethods”来自“java.lang.Class”。从应用程序启动一段时间后，总是会发生这种情况。
有人遇到过这样的问题吗？
编辑(25/12/2017):
不仅 hibernate validator 失败，xml解析也失败!
XML范例:
<SELFCARE>
<SESSION_ID>***</SESSION_ID>
</SELFCARE>
映射示例:
@XmlRootElement(name = "SELFCARE")
@XmlAccessorType(XmlAccessType.FIELD)
public class Session {
@XmlElement(name = "SESSION_ID")
private String sessionId;
}
解析异常:
WARN 2017.12.25 20:00:05.991 +0300 org.apache.cxf.jaxrs.provider.AbstractJAXBProvider javax.xml.bind.UnmarshalException
- with linked exception:
[com.sun.istack.SAXParseException2; lineNumber: 1; columnNumber: 1; unexpected element (uri:"", local:"SELFCARE"). Expected elements are <{}SELFCARE>]
at com.sun.xml.bind.v2.runtime.unmarshaller.UnmarshallerImpl.handleStreamException(UnmarshallerImpl.java:483)
at com.sun.xml.bind.v2.runtime.unmarshaller.UnmarshallerImpl.unmarshal0(UnmarshallerImpl.java:417)
at com.sun.xml.bind.v2.runtime.unmarshaller.UnmarshallerImpl.unmarshal(UnmarshallerImpl.java:386)
at org.apache.cxf.jaxrs.provider.JAXBElementProvider.unmarshalFromInputStream(JAXBElementProvider.java:294)
at org.apache.cxf.jaxrs.provider.JAXBElementProvider.doUnmarshal(JAXBElementProvider.java:245)
但是，如果反射有效，则映射是正确且有效的...
最佳答案
从堆栈跟踪中，我怀疑您正在使用HV5.x。我对吗？
该问题似乎与您具有代理的事实有关。我认为这可能与注释是关键的一部分有关。
您可以尝试HV 6.0.7.Final吗？我们摆脱了在此处使用缓存键中的注释的问题，因此它可以解决您的问题。
请注意，我们更改了groupId:现在是org.hibernate.validator(而不是org.hibernate)-请注意，如果HV依赖关系是从另一个工件传递过来的，请添加排除项。
您还需要javax.el依赖项:
<dependency>
<groupId>org.glassfish</groupId>
<artifactId>javax.el</artifactId>
<version>3.0.1-b08</version>
</dependency>
(请注意，您的依赖项中可能还有其他javax.el工件，因此请确保只有一个-Eclipse的依赖项层次结构 View 可能会有所帮助)
您还需要validation-api 2.0.1.Final(它与HV一起传递，但是如果您明确声明了版本，则可能必须更改其版本)。
除此之外，您不应该有任何兼容性问题(除非您使用的是诸如值处理之类的实验性功能):这是替代产品。 HV 6也明显更快，因此应该是双赢的情况。
请随时在此处报告升级的任何问题，我会帮忙。