springboot spring-boot fatjar: java.lang.ClassCastException: class com.sun.jndi.ldap.LdapCtx cannot be cast to class org.springframework.ldap.core.DirContextOperations (com.sun.jndi.ldap.LdapCtx is in module java.naming of loader 'bootstrap';

I have an app which runs fine in the IDE/cmdline, but through the fat-jar it fails with the following stacktrace - note the mention on "loader bootstrap" - since it works outside of the fat-jar I assume this has something to do with the fat-jar special loader.

I'm on spring-boot 2.2.5 and JDK14 (AdoptOpenJDK).

Caused by: java.lang.ClassCastException: class com.sun.jndi.ldap.LdapCtx cannot be cast to class org.springframework.ldap.core.DirContextOperations (com.sun.jndi.ldap.LdapCtx is in module java.naming of loader 'bootstrap'; org.springframework.ldap.core.DirContextOperations is in unnamed module of loader org.springframework.boot.loader.LaunchedURLClassLoader @1698c449)
    at org.springframework.ldap.core.LdapTemplate$34.mapFromContext(LdapTemplate.java:1843)
    at org.springframework.ldap.core.ContextMapperCallbackHandler.getObjectFromNameClassPair(ContextMapperCallbackHandler.java:69)
    at org.springframework.ldap.core.CollectingNameClassPairCallbackHandler.handleNameClassPair(CollectingNameClassPairCallbackHandler.java:50)
    at org.springframework.ldap.core.LdapTemplate.search(LdapTemplate.java:367)
    at org.springframework.ldap.core.LdapTemplate.search(LdapTemplate.java:309)
    at org.springframework.ldap.core.LdapTemplate.search(LdapTemplate.java:642)
    at org.springframework.ldap.core.LdapTemplate.search(LdapTemplate.java:578)
    at org.springframework.ldap.core.LdapTemplate.find(LdapTemplate.java:1840)
    at org.springframework.ldap.core.LdapTemplate.find(LdapTemplate.java:1861)
    at org.springframework.data.ldap.repository.query.AbstractLdapRepositoryQuery.execute(AbstractLdapRepositoryQuery.java:67)
    at org.springframework.data.repository.core.support.RepositoryFactorySupport$QueryExecutorMethodInterceptor.doInvoke(RepositoryFactorySupport.java:618)
    at org.springframework.data.repository.core.support.RepositoryFactorySupport$QueryExecutorMethodInterceptor.invoke(RepositoryFactorySupport.java:605)
    at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:186)
    at org.springframework.aop.interceptor.ExposeInvocationInterceptor.invoke(ExposeInvocationInterceptor.java:95)
    at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:186)
    at org.springframework.aop.framework.JdkDynamicAopProxy.invoke(JdkDynamicAopProxy.java:212)
    at com.sun.proxy.$Proxy66.findByEmailOrUserPrincipalName(Unknown Source)
    at com.evry.fs.devtools.ldap.LdapEmployeeServiceImpl.findByEmail(LdapEmployeeServiceImpl.java:22)
    at com.evry.fs.devtools.ldap.LdapEmployeeServiceImpl$$FastClassBySpringCGLIB$$17bc38c9.invoke(<generated>)
    at org.springframework.cglib.proxy.MethodProxy.invoke(MethodProxy.java:218)
    at org.springframework.aop.framework.CglibAopProxy$CglibMethodInvocation.invokeJoinpoint(CglibAopProxy.java:769)
    at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:163)
    at org.springframework.aop.framework.CglibAopProxy$CglibMethodInvocation.proceed(CglibAopProxy.java:747)
    at org.springframework.validation.beanvalidation.MethodValidationInterceptor.invoke(MethodValidationInterceptor.java:120)
    at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:186)
    at org.springframework.aop.framework.CglibAopProxy$CglibMethodInvocation.proceed(CglibAopProxy.java:747)
    at org.springframework.aop.framework.CglibAopProxy$DynamicAdvisedInterceptor.intercept(CglibAopProxy.java:689)
    at com.evry.fs.devtools.ldap.LdapEmployeeServiceImpl$$EnhancerBySpringCGLIB$$3403431a.findByEmail(<generated>)
    at com.evry.fs.devtools.ghe.GheService.checkValid(GheService.java:88)
    at java.base/java.util.stream.ReferencePipeline$3$1.accept(ReferencePipeline.java:195)
    at java.base/java.util.stream.ReferencePipeline$2$1.accept(ReferencePipeline.java:177)
    at java.base/java.util.stream.ReferencePipeline$3$1.accept(ReferencePipeline.java:195)
    at java.base/java.util.stream.ReferencePipeline$2$1.accept(ReferencePipeline.java:177)
    at java.base/java.util.stream.ReferencePipeline$2$1.accept(ReferencePipeline.java:177)
    at java.base/java.util.Spliterators$ArraySpliterator.forEachRemaining(Spliterators.java:948)
    at java.base/java.util.stream.AbstractPipeline.copyInto(AbstractPipeline.java:484)
    at java.base/java.util.stream.AbstractPipeline.wrapAndCopyInto(AbstractPipeline.java:474)
    at java.base/java.util.stream.ReduceOps$ReduceTask.doLeaf(ReduceOps.java:952)
    at java.base/java.util.stream.ReduceOps$ReduceTask.doLeaf(ReduceOps.java:926)
    at java.base/java.util.stream.AbstractTask.compute(AbstractTask.java:327)
    at java.base/java.util.concurrent.CountedCompleter.exec(CountedCompleter.java:746)
    at java.base/java.util.concurrent.ForkJoinTask.doExec(ForkJoinTask.java:290)
    at java.base/java.util.concurrent.ForkJoinPool$WorkQueue.topLevelExec(ForkJoinPool.java:1016)
    at java.base/java.util.concurrent.ForkJoinPool.scan(ForkJoinPool.java:1665)
    at java.base/java.util.concurrent.ForkJoinPool.runWorker(ForkJoinPool.java:1598)
    at java.base/java.util.concurrent.ForkJoinWorkerThread.run(ForkJoinWorkerThread.java:177)

Comment From: davidkarlsen

See updated spring ldap issue and https://stackoverflow.com/questions/45742638/classcastexception-while-searching-for-ldap-user - this is not a boot-issue.