急求老师解决：java.lang.NoClassDefFoundError

无法插入成功数据。jar已正确导入

java.lang.NoClassDefFoundError: Could not initialize class com.imooc.jdbc.utils.JDBCUtils

代码部分和老师写的一模一样，编译时没有错误，运行就出错。IDE环境：eclipse

运行错误信息：

java.lang.NoClassDefFoundError: Could not initialize class com.imooc.jdbc.utils.JDBCUtils

at com.imooc.jdbc.demo1.JDBCDemo3.demo1(JDBCDemo3.java:33)

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

at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)

at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)

at java.lang.reflect.Method.invoke(Method.java:498)

at org.junit.runners.model.FrameworkMethod$1.runReflectiveCall(FrameworkMethod.java:50)

at org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:12)

at org.junit.runners.model.FrameworkMethod.invokeExplosively(FrameworkMethod.java:47)

at org.junit.internal.runners.statements.InvokeMethod.evaluate(InvokeMethod.java:17)

at org.junit.runners.ParentRunner.runLeaf(ParentRunner.java:325)

at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:78)

at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:57)

at org.junit.runners.ParentRunner$3.run(ParentRunner.java:290)

at org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:71)

at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:288)

at org.junit.runners.ParentRunner.access$000(ParentRunner.java:58)

at org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:268)

at org.junit.runners.ParentRunner.run(ParentRunner.java:363)

at org.junit.runner.JUnitCore.run(JUnitCore.java:137)

at org.junit.runner.JUnitCore.run(JUnitCore.java:115)

at org.junit.vintage.engine.execution.RunnerExecutor.execute(RunnerExecutor.java:39)

at java.util.stream.ForEachOps$ForEachOp$OfRef.accept(ForEachOps.java:184)

at java.util.stream.ReferencePipeline$3$1.accept(ReferencePipeline.java:193)

at java.util.Iterator.forEachRemaining(Iterator.java:116)

at java.util.Spliterators$IteratorSpliterator.forEachRemaining(Spliterators.java:1801)

at java.util.stream.AbstractPipeline.copyInto(AbstractPipeline.java:481)

at java.util.stream.AbstractPipeline.wrapAndCopyInto(AbstractPipeline.java:471)

at java.util.stream.ForEachOps$ForEachOp.evaluateSequential(ForEachOps.java:151)

at java.util.stream.ForEachOps$ForEachOp$OfRef.evaluateSequential(ForEachOps.java:174)

at java.util.stream.AbstractPipeline.evaluate(AbstractPipeline.java:234)

at java.util.stream.ReferencePipeline.forEach(ReferencePipeline.java:418)

at org.junit.vintage.engine.VintageTestEngine.executeAllChildren(VintageTestEngine.java:79)

at org.junit.vintage.engine.VintageTestEngine.execute(VintageTestEngine.java:70)

at org.junit.platform.launcher.core.DefaultLauncher.execute(DefaultLauncher.java:220)

at org.junit.platform.launcher.core.DefaultLauncher.lambda$execute$6(DefaultLauncher.java:188)

at org.junit.platform.launcher.core.DefaultLauncher.withInterceptedStreams(DefaultLauncher.java:202)

at org.junit.platform.launcher.core.DefaultLauncher.execute(DefaultLauncher.java:181)

at org.junit.platform.launcher.core.DefaultLauncher.execute(DefaultLauncher.java:128)

at org.eclipse.jdt.internal.junit5.runner.JUnit5TestReference.run(JUnit5TestReference.java:89)

at org.eclipse.jdt.internal.junit.runner.TestExecution.run(TestExecution.java:41)

at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:541)

at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:763)

at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.run(RemoteTestRunner.java:463)

at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.main(RemoteTestRunner.java:209)