java.sql.SQLNonTransientConnectionException: 用户 ID 长度 (0) 超出 1 到 255 的范围

使用Derby数据库进行JUnit测试时, 报出了org.springframework.transaction.CannotCreateTransactionException: Could not open JDBC Connection for transaction; nested exception is java.sql.SQLNonTransientConnectionException: 用户 ID 长度 (0) 超出 1 到 255 的范围。错误, 详细的Failure Trace如下:

org.springframework.transaction.CannotCreateTransactionException: Could not open JDBC Connection for transaction; nested exception is java.sql.SQLNonTransientConnectionException: 用户 ID 长度 (0) 超出 1 到 255 的范围。
	at org.springframework.jdbc.datasource.DataSourceTransactionManager.doBegin(DataSourceTransactionManager.java:242)
	at org.springframework.transaction.support.AbstractPlatformTransactionManager.getTransaction(AbstractPlatformTransactionManager.java:373)
	at org.springframework.test.AbstractTransactionalSpringContextTests.startNewTransaction(AbstractTransactionalSpringContextTests.java:349)
	at org.springframework.test.AbstractTransactionalSpringContextTests.onSetUp(AbstractTransactionalSpringContextTests.java:201)
	at org.springframework.test.AbstractSingleSpringContextTests.setUp(AbstractSingleSpringContextTests.java:104)
	at junit.framework.TestCase.runBare(TestCase.java:128)
	at org.springframework.test.ConditionalTestCase.runBare(ConditionalTestCase.java:79)
	at junit.framework.TestResult$1.protect(TestResult.java:106)
	at junit.framework.TestResult.runProtected(TestResult.java:124)
	at junit.framework.TestResult.run(TestResult.java:109)
	at junit.framework.TestCase.run(TestCase.java:120)
	at junit.framework.TestSuite.runTest(TestSuite.java:230)
	at junit.framework.TestSuite.run(TestSuite.java:225)
	at org.eclipse.jdt.internal.junit.runner.junit3.JUnit3TestReference.run(JUnit3TestReference.java:130)
	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)
Caused by: java.sql.SQLNonTransientConnectionException: 用户 ID 长度 (0) 超出 1 到 255 的范围。
	at org.apache.derby.client.am.SQLExceptionFactory40.getSQLException(Unknown Source)
	at org.apache.derby.client.am.SqlException.getSQLException(Unknown Source)
	at org.apache.derby.jdbc.ClientDriver.connect(Unknown Source)
	at java.sql.DriverManager.getConnection(DriverManager.java:571)
	at java.sql.DriverManager.getConnection(DriverManager.java:187)
	at org.springframework.jdbc.datasource.DriverManagerDataSource.getConnectionFromDriverManager(DriverManagerDataSource.java:153)
	at org.springframework.jdbc.datasource.DriverManagerDataSource.getConnectionFromDriver(DriverManagerDataSource.java:144)
	at org.springframework.jdbc.datasource.AbstractDriverBasedDataSource.getConnectionFromDriver(AbstractDriverBasedDataSource.java:155)
	at org.springframework.jdbc.datasource.AbstractDriverBasedDataSource.getConnection(AbstractDriverBasedDataSource.java:120)
	at org.springframework.jdbc.datasource.DataSourceTransactionManager.doBegin(DataSourceTransactionManager.java:204)
	... 18 more
Caused by: org.apache.derby.client.am.SqlException: 用户 ID 长度 (0) 超出 1 到 255 的范围。
	at org.apache.derby.client.net.NetConnection.checkUserLength(Unknown Source)
	at org.apache.derby.client.net.NetConnection.checkUser(Unknown Source)
	at org.apache.derby.client.net.NetConnection.checkUserPassword(Unknown Source)
	at org.apache.derby.client.net.NetConnection.flowConnect(Unknown Source)
	at org.apache.derby.client.net.NetConnection.(Unknown Source)
	at org.apache.derby.client.net.NetConnection40.(Unknown Source)
	at org.apache.derby.client.net.ClientJDBCObjectFactoryImpl40.newNetConnection(Unknown Source)
	... 26 more

在经过仔细的检查后, 发现原来是配置文件中没有给这个数据库指定用户名和密码(用户名和密码为空), 结果导致了这个错误.

beans.xml文件, 设置username和password的value后, 重新测试, 错误消失.