我试图通过Java代码(Hibernate)从MySQL DB获取MD5加密传递。但我不能得到字符串或任何合理的Java类型。

我唯一得到的是这个无益的信息：

java.lang.ClassCastException：[B无法转换为com.mysql.jdbc.Blob(或任何我尝试转换的Java类型)。

这是我的方法：

public void testCrypto() {

session.beginTransaction();

// creates native SQL query

// uses native MySQL's MD5 crypto

final Blob pass = (Blob) session.createSQLQuery("SELECT MD5('somePass')")

.list().get(0);

session.getTransaction().commit();

}

这里是完整的堆栈跟踪：

java.lang.ClassCastException: [B cannot be cast to com.mysql.jdbc.Blob

at domain.DatabaseTest.testCrypto(DatabaseTest.java:57)

at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)

at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)

at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)

at java.lang.reflect.Method.invoke(Unknown Source)

at junit.framework.TestCase.runTest(TestCase.java:168)

at junit.framework.TestCase.runBare(TestCase.java:134)

at junit.framework.TestResult$1.protect(TestResult.java:110)

at junit.framework.TestResult.runProtected(TestResult.java:128)

at junit.framework.TestResult.run(TestResult.java:113)

at junit.framework.TestCase.run(TestCase.java:124)

at junit.framework.TestSuite.runTest(TestSuite.java:232)

at junit.framework.TestSuite.run(TestSuite.java:227)

at org.junit.internal.runners.JUnit38ClassRunner.run(JUnit38ClassRunner.java:83)

at org.eclipse.jdt.internal.junit4.runner.JUnit4TestReference.run(JUnit4TestReference.java:49)

at org.eclipse.jdt.internal.junit.runner.TestExecution.run(TestExecution.java:38)

at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:467)

at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:683)

at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.run(RemoteTestRunner.java:390)

at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.main(RemoteTestRunner.java:197)