相关疑难解决方法(0)

我试图通过Java代码(Hibernate)从MySQL DB获得MD5加密传递.但我不能得到String或任何合理的Java类型.

我唯一得到的是这个无用的消息: java.lang.ClassCastException:[B不能转换为com.mysql.jdbc.Blob(或者我尝试转换的任何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) …