由于javax.validation异常，ConcurrentModification异常

由于javax.validation问题，api抛出并发修改异常，我面临着这个奇怪的问题

    java.util.ConcurrentModificationException: null
    at java.util.HashMap$HashIterator.nextNode(HashMap.java:1445) ~[na:1.8.0_265]
    at java.util.HashMap$ValueIterator.next(HashMap.java:1474) ~[na:1.8.0_265]
    at org.eclipse.persistence.jpa.PersistenceProvider.isLoadedWithReference(PersistenceProvider.java:464) ~[eclipselink-2.6.1.jar:2.6.1.v20150916-55dc7c3]
    at javax.persistence.Persistence$PersistenceUtilImpl.isLoaded(Persistence.java:154) ~[javax.persistence-2.1.0.jar:2.1.0]
    at org.hibernate.validator.internal.engine.resolver.JPATraversableResolver.isReachable(JPATraversableResolver.java:56) ~[bean-validator-2.2.0.jar:5.0.0.Final]
    at org.hibernate.validator.internal.engine.resolver.DefaultTraversableResolver.isReachable(DefaultTraversableResolver.java:130) ~[bean-validator-2.2.0.jar:5.0.0.Final]
    at org.hibernate.validator.internal.engine.resolver.SingleThreadCachedTraversableResolver.isReachable(SingleThreadCachedTraversableResolver.java:46) ~[bean-validator-2.2.0.jar:5.0.0.Final] [1 skipped]
    at org.hibernate.validator.internal.engine.ValidatorImpl.isReachable(ValidatorImpl.java:1307) ~[bean-validator-2.2.0.jar:5.0.0.Final]
    at org.hibernate.validator.internal.engine.ValidatorImpl.isValidationRequired(ValidatorImpl.java:1292) ~[bean-validator-2.2.0.jar:5.0.0.Final]
    ... 49 common frames omitted
Wrapped by: javax.validation.ValidationException: HV000041: Call to TraversableResolver.isReachable() threw an exception.
    at org.hibernate.validator.internal.engine.ValidatorImpl.isReachable(ValidatorImpl.java:1316) ~[bean-validator-2.2.0.jar:5.0.0.Final]
    at org.hibernate.validator.internal.engine.ValidatorImpl.isValidationRequired(ValidatorImpl.java:1292) ~[bean-validator-2.2.0.jar:5.0.0.Final]
    at org.hibernate.validator.internal.engine.ValidatorImpl.validateConstraint(ValidatorImpl.java:475) ~[bean-validator-2.2.0.jar:5.0.0.Final]
    at org.hibernate.validator.internal.engine.ValidatorImpl.validateConstraintsForDefaultGroup(ValidatorImpl.java:424) ~[bean-validator-2.2.0.jar:5.0.0.Final]
    at org.hibernate.validator.internal.engine.ValidatorImpl.validateConstraintsForCurrentGroup(ValidatorImpl.java:388) ~[bean-validator-2.2.0.jar:5.0.0.Final]
    at org.hibernate.validator.internal.engine.ValidatorImpl.validateInContext(ValidatorImpl.java:340) ~[bean-validator-2.2.0.jar:5.0.0.Final]
    at org.hibernate.validator.internal.engine.ValidatorImpl.validateCascadedConstraint(ValidatorImpl.java:635) ~[bean-validator-2.2.0.jar:5.0.0.Final]
    at org.hibernate.validator.internal.engine.ValidatorImpl.validateCascadedConstraints(ValidatorImpl.java:524) ~[bean-validator-2.2.0.jar:5.0.0.Final]
    at org.hibernate.validator.internal.engine.ValidatorImpl.validateInContext(ValidatorImpl.java:349) ~[bean-validator-2.2.0.jar:5.0.0.Final]
    at org.hibernate.validator.internal.engine.ValidatorImpl.validateCascadedConstraint(ValidatorImpl.java:635) ~[bean-validator-2.2.0.jar:5.0.0.Final]
    at org.hibernate.validator.internal.engine.ValidatorImpl.validateCascadedConstraints(ValidatorImpl.java:524) ~[bean-validator-2.2.0.jar:5.0.0.Final]
    at org.hibernate.validator.internal.engine.ValidatorImpl.validateParametersInContext(ValidatorImpl.java:916) ~[bean-validator-2.2.0.jar:5.0.0.Final]
    at org.hibernate.validator.internal.engine.ValidatorImpl.validateParameters(ValidatorImpl.java:240) ~[bean-validator-2.2.0.jar:5.0.0.Final]
    at org.hibernate.validator.internal.engine.ValidatorImpl.validateParameters(ValidatorImpl.java:198) ~[bean-validator-2.2.0.jar:5.0.0.Final]
    at org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1095) [webapp-runner.jar:na] [28 skipped]
    at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:672) [webapp-runner.jar:na]
    at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1502) [webapp-runner.jar:na]
    at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.run(NioEndpoint.java:1458) [webapp-runner.jar:na]
    at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149) [na:1.8.0_265]
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624) [na:1.8.0_265]
    at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61) [webapp-runner.jar:na]
    at java.lang.Thread.run(Thread.java:748) [na:1.8.0_265]

---

堆栈跟踪没有说明bean中的哪个验证导致了问题。

显然，异常堆栈跟踪说明hashmap中发生了并发修改异常。如果在遍历映射值或API时使用迭代器，而这些值或API不像通用Hashmap对象那样是线程安全的，则会发生并发修改异常。尝试使用并发hashmap，您的问题应该会得到解决。

看起来stacktrace正在以一种特殊的方式格式化，方法是。。。什么

显示它的正常方式是首先显示主要异常，然后显示

原因

（或包装的）异常链。但是您向我们展示的是包装异常，后面是包装它的异常

这意味着，

ConcurrentModificationException

导致了

ValidationException

。。。而不是相反

---

不幸的是，这并不能解释实际发生的情况。

com.foo.mapper.CustomExceptionMapper：意外的Bean验证问题。这是打印并发异常之后的异常头。这对我有帮助吗？很明显，我没有看到任何代码作为api的一部分会导致并发修改异常。堆栈跟踪也表明它来自hibernate。所以我怀疑这是图书馆的问题，这种情况多久发生一次？看起来像是一个时间问题，因为EclipseLink PeristenceProvider所涉及的代码正在对持久性单元进行迭代，以确定实体属性是否作为验证过程的一部分加载。发生这种情况时，必须从持久性单元列表中添加/删除某些内容-请随意提交一个bug，但这非常奇怪，除非您的环境中正在进行大量部署/取消部署操作。