Java 如何处理'；非法区块大小异常'；使用EclipseLink 2.6.4版创建EntityManager时？

我使用EclipseLink和Java Persistence API连接到本地数据库，但是当我创建

EntityManager

对象时，出现以下错误：

[EL Severe]: ejb: 2017-06-04 19:29:55.066--ServerSession(1644987969)--Exception [EclipseLink-7107] (Eclipse Persistence Services - 2.6.4.v20160829-44060b6): org.eclipse.persistence.exceptions.ValidationException
Exception Description: Error encountered during string decryption.
Internal Exception: javax.crypto.IllegalBlockSizeException: Input length must be multiple of 8 when decrypting with padded cipher
Exception in thread "main" javax.persistence.PersistenceException: Exception [EclipseLink-7107] (Eclipse Persistence Services - 2.6.4.v20160829-44060b6): org.eclipse.persistence.exceptions.ValidationException
Exception Description: Error encountered during string decryption.
Internal Exception: javax.crypto.IllegalBlockSizeException: Input length must be multiple of 8 when decrypting with padded cipher

在我创建EntityManager的行处的错误堆栈跟踪点：

private EntityManagerFactory factory;
    private EntityManager em;

    public JpaDatabaseConnection() {

        factory = Persistence.createEntityManagerFactory("blogspace");
        em = factory.createEntityManager();
    }

我通过Maven依赖项和JDBC驱动程序向项目类路径添加了eclipselink和java持久性API。这是我的persistence.xml文件（位于项目包所在文件夹的META-INF目录中）：

pl.furman.server.database.entities.User

问题的原因是什么？如何解决？我知道JDBC驱动程序本身可能工作正常，因为当我故意在

persistence.xml

文件中输入错误的密码时，我发现授权失败了。数据库已经建立并运行，因为我可以从shell和eclipsetoad扩展创建查询并将数据插入数据库

事先谢谢你的帮助

---

编辑：问题在于persistence.xml中的用户名和/或密码。当我将其更改为不同长度的用户和密码时，连接可以正常工作。但是我仍然不知道为什么会发生这种情况。

我可以用EclipseLink版本2.6.4确认这种奇怪的行为，因为我复制了您的设置。以下是完整的堆栈跟踪：

Internal Exception: javax.crypto.IllegalBlockSizeException: Input length must be multiple of 8 when decrypting with padded cipher
    at org.eclipse.persistence.internal.jpa.EntityManagerSetupImpl.deploy(EntityManagerSetupImpl.java:815)
    at org.eclipse.persistence.internal.jpa.EntityManagerFactoryDelegate.getAbstractSession(EntityManagerFactoryDelegate.java:205)
    at org.eclipse.persistence.internal.jpa.EntityManagerFactoryDelegate.createEntityManagerImpl(EntityManagerFactoryDelegate.java:305)
    at org.eclipse.persistence.internal.jpa.EntityManagerFactoryImpl.createEntityManagerImpl(EntityManagerFactoryImpl.java:337)
    at org.eclipse.persistence.internal.jpa.EntityManagerFactoryImpl.createEntityManager(EntityManagerFactoryImpl.java:303)
    at demo.service.UserService.<init>(UserService.java:14)
    at demo.Runner.main(Runner.java:8)
Caused by: Exception [EclipseLink-7107] (Eclipse Persistence Services - 2.6.4.v20160829-44060b6): org.eclipse.persistence.exceptions.ValidationException
Exception Description: Error encountered during string decryption.
Internal Exception: javax.crypto.IllegalBlockSizeException: Input length must be multiple of 8 when decrypting with padded cipher
    at org.eclipse.persistence.exceptions.ValidationException.errorDecryptingPassword(ValidationException.java:894)
    at org.eclipse.persistence.internal.security.JCEEncryptor.decryptPassword(JCEEncryptor.java:114)
    at org.eclipse.persistence.internal.jpa.EntityManagerSetupImpl.updateLogins(EntityManagerSetupImpl.java:2404)
    at org.eclipse.persistence.internal.jpa.EntityManagerSetupImpl.updateSession(EntityManagerSetupImpl.java:2716)
    at org.eclipse.persistence.internal.jpa.EntityManagerSetupImpl.deploy(EntityManagerSetupImpl.java:710)
    ... 6 more
Caused by: javax.crypto.IllegalBlockSizeException: Input length must be multiple of 8 when decrypting with padded cipher
    at com.sun.crypto.provider.CipherCore.doFinal(CipherCore.java:934)
    at com.sun.crypto.provider.CipherCore.doFinal(CipherCore.java:845)
    at com.sun.crypto.provider.DESCipher.engineDoFinal(DESCipher.java:314)
    at javax.crypto.Cipher.doFinal(Cipher.java:2165)
    at org.eclipse.persistence.internal.security.JCEEncryptor.decryptPassword(JCEEncryptor.java:109)
    ... 9 more

如果这是一个独立的项目，请查找最新的。只需删除旧的jar文件，并将新文件放入应用程序的类路径中

顺便说一句，当我在数据库中以及在

persistence.xml

中将PW更改为

123456789

时，即使在有缺陷的版本2.6.4中，它也能工作。奇怪，不是吗

---

希望有帮助。

您的代码中有用户密码加密功能吗？没有，我没有使用密码加密功能。

Internal Exception: javax.crypto.IllegalBlockSizeException: Input length must be multiple of 8 when decrypting with padded cipher
    at org.eclipse.persistence.internal.jpa.EntityManagerSetupImpl.deploy(EntityManagerSetupImpl.java:815)
    at org.eclipse.persistence.internal.jpa.EntityManagerFactoryDelegate.getAbstractSession(EntityManagerFactoryDelegate.java:205)
    at org.eclipse.persistence.internal.jpa.EntityManagerFactoryDelegate.createEntityManagerImpl(EntityManagerFactoryDelegate.java:305)
    at org.eclipse.persistence.internal.jpa.EntityManagerFactoryImpl.createEntityManagerImpl(EntityManagerFactoryImpl.java:337)
    at org.eclipse.persistence.internal.jpa.EntityManagerFactoryImpl.createEntityManager(EntityManagerFactoryImpl.java:303)
    at demo.service.UserService.<init>(UserService.java:14)
    at demo.Runner.main(Runner.java:8)
Caused by: Exception [EclipseLink-7107] (Eclipse Persistence Services - 2.6.4.v20160829-44060b6): org.eclipse.persistence.exceptions.ValidationException
Exception Description: Error encountered during string decryption.
Internal Exception: javax.crypto.IllegalBlockSizeException: Input length must be multiple of 8 when decrypting with padded cipher
    at org.eclipse.persistence.exceptions.ValidationException.errorDecryptingPassword(ValidationException.java:894)
    at org.eclipse.persistence.internal.security.JCEEncryptor.decryptPassword(JCEEncryptor.java:114)
    at org.eclipse.persistence.internal.jpa.EntityManagerSetupImpl.updateLogins(EntityManagerSetupImpl.java:2404)
    at org.eclipse.persistence.internal.jpa.EntityManagerSetupImpl.updateSession(EntityManagerSetupImpl.java:2716)
    at org.eclipse.persistence.internal.jpa.EntityManagerSetupImpl.deploy(EntityManagerSetupImpl.java:710)
    ... 6 more
Caused by: javax.crypto.IllegalBlockSizeException: Input length must be multiple of 8 when decrypting with padded cipher
    at com.sun.crypto.provider.CipherCore.doFinal(CipherCore.java:934)
    at com.sun.crypto.provider.CipherCore.doFinal(CipherCore.java:845)
    at com.sun.crypto.provider.DESCipher.engineDoFinal(DESCipher.java:314)
    at javax.crypto.Cipher.doFinal(Cipher.java:2165)
    at org.eclipse.persistence.internal.security.JCEEncryptor.decryptPassword(JCEEncryptor.java:109)
    ... 9 more

 <dependency>
     <groupId>org.eclipse.persistence</groupId>
     <artifactId>eclipselink</artifactId>
     <version>2.6.5-RC2</version>
 </dependency>