Hibernate uses javassist as dependency. Dependency version is 3.15.0-GA.
When using it with JDK8 classes it crashes:
Caused by: java.lang.RuntimeException: error trying to scan <jar-file>: file:/Users/dionis/projects/pods4ety/pods4ety-rest/target/classes
at org.hibernate.ejb.Ejb3Configuration.scanForClasses(Ejb3Configuration.java:864)
at org.hibernate.ejb.Ejb3Configuration.configure(Ejb3Configuration.java:606)
at org.hibernate.ejb.HibernatePersistence.createContainerEntityManagerFactory(HibernatePersistence.java:75)
at org.springframework.orm.jpa.LocalContainerEntityManagerFactoryBean.createNativeEntityManagerFactory(LocalContainerEntityManagerFactoryBean.java:293)
at org.springframework.orm.jpa.AbstractEntityManagerFactoryBean.afterPropertiesSet(AbstractEntityManagerFactoryBean.java:317)
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.invokeInitMethods(AbstractAutowireCapableBeanFactory.java:1566)
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.initializeBean(AbstractAutowireCapableBeanFactory.java:1503)
... 38 more
Caused by: java.lang.RuntimeException: Error while reading file:/Users/dionis/projects/pods4ety/pods4ety-rest/target/classes
at org.hibernate.ejb.packaging.NativeScanner.getClassesInJar(NativeScanner.java:131)
at org.hibernate.ejb.Ejb3Configuration.addScannedEntries(Ejb3Configuration.java:487)
at org.hibernate.ejb.Ejb3Configuration.scanForClasses(Ejb3Configuration.java:861)
... 44 more
Caused by: java.io.IOException: invalid constant type: 18
at javassist.bytecode.ConstPool.readOne(ConstPool.java:1113)
at javassist.bytecode.ConstPool.read(ConstPool.java:1056)
at javassist.bytecode.ConstPool.<init>(ConstPool.java:150)
at javassist.bytecode.ClassFile.read(ClassFile.java:765)
at javassist.bytecode.ClassFile.<init>(ClassFile.java:109)
at org.hibernate.ejb.packaging.AbstractJarVisitor.checkAnnotationMatching(AbstractJarVisitor.java:246)
at org.hibernate.ejb.packaging.AbstractJarVisitor.executeJavaElementFilter(AbstractJarVisitor.java:212)
at org.hibernate.ejb.packaging.AbstractJarVisitor.addElement(AbstractJarVisitor.java:173)
at org.hibernate.ejb.packaging.ExplodedJarVisitor.getClassNamesInTree(ExplodedJarVisitor.java:126)
at org.hibernate.ejb.packaging.ExplodedJarVisitor.getClassNamesInTree(ExplodedJarVisitor.java:134)
at org.hibernate.ejb.packaging.ExplodedJarVisitor.getClassNamesInTree(ExplodedJarVisitor.java:134)
at org.hibernate.ejb.packaging.ExplodedJarVisitor.getClassNamesInTree(ExplodedJarVisitor.java:134)
at org.hibernate.ejb.packaging.ExplodedJarVisitor.doProcessElements(ExplodedJarVisitor.java:92)
at org.hibernate.ejb.packaging.AbstractJarVisitor.getMatchingEntries(AbstractJarVisitor.java:149)
at org.hibernate.ejb.packaging.NativeScanner.getClassesInJar(NativeScanner.java:128)
... 46 more

. Upgrading to latest version of javassist fixes this issue.