hessian 错误，请大家帮忙！

org.springframework.remoting.RemoteAccessException: Cannot access Hessian remote service at [http://saas.800jit.com/comws/remoting/SiteServices-hessian-clone]; nested exception is com.caucho.hessian.io.HessianProtocolException: 'org.springframework.jdbc.UncategorizedSQLException' could not be instantiated
at org.springframework.remoting.caucho.HessianClientInterceptor.convertHessianAccessException(HessianClientInterceptor.java:254)
at org.springframework.remoting.caucho.HessianClientInterceptor.invoke(HessianClientInterceptor.java:225)
at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:171)
at org.springframework.aop.framework.JdkDynamicAopProxy.invoke(JdkDynamicAopProxy.java:204)
at $Proxy1.getUserSiteDefaultAppByUserId(Unknown Source)
at com.olymtech.integration.webservice.impl.config.test.SiteTest.testNewRegistFromWeb(SiteTest.java:53)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:597)
at junit.framework.TestCase.runTest(TestCase.java:164)
at junit.framework.TestCase.runBare(TestCase.java:130)
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.junit.internal.runners.JUnit38ClassRunner.run(JUnit38ClassRunner.java:81)
at org.eclipse.jdt.internal.junit4.runner.JUnit4TestReference.run(JUnit4TestReference.java:46)
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: com.caucho.hessian.io.HessianProtocolException: 'org.springframework.jdbc.UncategorizedSQLException' could not be instantiated