JavaWeb：c3p0配置问题java.lang.NoClassDefFoundError: com/mchange/v2/ser/Indirector

错误显示

java.lang.NoClassDefFoundError: com/mchange/v2/ser/Indirector

    at dbdemo.JdbcUtils.<clinit>(JdbcUtils.java:)
    at test.JdbcUtilsTest.getConnection(JdbcUtilsTest.java:)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:)
    at java.lang.reflect.Method.invoke(Method.java:)
    at org.junit.platform.commons.util.ReflectionUtils.invokeMethod(ReflectionUtils.java:)
    at org.junit.jupiter.engine.execution.ExecutableInvoker.invoke(ExecutableInvoker.java:)
    at org.junit.jupiter.engine.descriptor.TestMethodTestDescriptor.lambda$invokeTestMethod$(TestMethodTestDescriptor.java:)
    at org.junit.platform.engine.support.hierarchical.ThrowableCollector.execute(ThrowableCollector.java:)
    at org.junit.jupiter.engine.descriptor.TestMethodTestDescriptor.invokeTestMethod(TestMethodTestDescriptor.java:)
    at org.junit.jupiter.engine.descriptor.TestMethodTestDescriptor.execute(TestMethodTestDescriptor.java:)
    at org.junit.jupiter.engine.descriptor.TestMethodTestDescriptor.execute(TestMethodTestDescriptor.java:)
    at org.junit.platform.engine.support.hierarchical.NodeTestTask.lambda$executeRecursively$(NodeTestTask.java:)
    at org.junit.platform.engine.support.hierarchical.ThrowableCollector.execute(ThrowableCollector.java:)
    at org.junit.platform.engine.support.hierarchical.NodeTestTask.lambda$executeRecursively$(NodeTestTask.java:)
    at org.junit.platform.engine.support.hierarchical.Node.around(Node.java:)
    at org.junit.platform.engine.support.hierarchical.NodeTestTask.lambda$executeRecursively$(NodeTestTask.java:)
    at org.junit.platform.engine.support.hierarchical.ThrowableCollector.execute(ThrowableCollector.java:)
    at org.junit.platform.engine.support.hierarchical.NodeTestTask.executeRecursively(NodeTestTask.java:)
    at org.junit.platform.engine.support.hierarchical.NodeTestTask.execute(NodeTestTask.java:)
    at java.util.ArrayList.forEach(ArrayList.java:)
    at org.junit.platform.engine.support.hierarchical.SameThreadHierarchicalTestExecutorService.invokeAll(SameThreadHierarchicalTestExecutorService.java:)
    at org.junit.platform.engine.support.hierarchical.NodeTestTask.lambda$executeRecursively$(NodeTestTask.java:)
    at org.junit.platform.engine.support.hierarchical.ThrowableCollector.execute(ThrowableCollector.java:)
    at org.junit.platform.engine.support.hierarchical.NodeTestTask.lambda$executeRecursively$(NodeTestTask.java:)
    at org.junit.platform.engine.support.hierarchical.Node.around(Node.java:)
    at org.junit.platform.engine.support.hierarchical.NodeTestTask.lambda$executeRecursively$(NodeTestTask.java:)
    at org.junit.platform.engine.support.hierarchical.ThrowableCollector.execute(ThrowableCollector.java:)
    at org.junit.platform.engine.support.hierarchical.NodeTestTask.executeRecursively(NodeTestTask.java:)
    at org.junit.platform.engine.support.hierarchical.NodeTestTask.execute(NodeTestTask.java:)
    at java.util.ArrayList.forEach(ArrayList.java:)
    at org.junit.platform.engine.support.hierarchical.SameThreadHierarchicalTestExecutorService.invokeAll(SameThreadHierarchicalTestExecutorService.java:)
    at org.junit.platform.engine.support.hierarchical.NodeTestTask.lambda$executeRecursively$(NodeTestTask.java:)
    at org.junit.platform.engine.support.hierarchical.ThrowableCollector.execute(ThrowableCollector.java:)
    at org.junit.platform.engine.support.hierarchical.NodeTestTask.lambda$executeRecursively$(NodeTestTask.java:)
    at org.junit.platform.engine.support.hierarchical.Node.around(Node.java:)
    at org.junit.platform.engine.support.hierarchical.NodeTestTask.lambda$executeRecursively$(NodeTestTask.java:)
    at org.junit.platform.engine.support.hierarchical.ThrowableCollector.execute(ThrowableCollector.java:)
    at org.junit.platform.engine.support.hierarchical.NodeTestTask.executeRecursively(NodeTestTask.java:)
    at org.junit.platform.engine.support.hierarchical.NodeTestTask.execute(NodeTestTask.java:)
    at org.junit.platform.engine.support.hierarchical.SameThreadHierarchicalTestExecutorService.submit(SameThreadHierarchicalTestExecutorService.java:)
    at org.junit.platform.engine.support.hierarchical.HierarchicalTestExecutor.execute(HierarchicalTestExecutor.java:)
    at org.junit.platform.engine.support.hierarchical.HierarchicalTestEngine.execute(HierarchicalTestEngine.java:)
    at org.junit.platform.launcher.core.DefaultLauncher.execute(DefaultLauncher.java:)
    at org.junit.platform.launcher.core.DefaultLauncher.lambda$execute$(DefaultLauncher.java:)
    at org.junit.platform.launcher.core.DefaultLauncher.withInterceptedStreams(DefaultLauncher.java:)
    at org.junit.platform.launcher.core.DefaultLauncher.execute(DefaultLauncher.java:)
    at org.junit.platform.launcher.core.DefaultLauncher.execute(DefaultLauncher.java:)
    at com.intellij.junit5.JUnit5IdeaTestRunner.startRunnerWithArgs(JUnit5IdeaTestRunner.java:)
    at com.intellij.rt.execution.junit.IdeaTestRunner$Repeater.startRunnerWithArgs(IdeaTestRunner.java:)
    at com.intellij.rt.execution.junit.JUnitStarter.prepareStreamsAndStart(JUnitStarter.java:)
    at com.intellij.rt.execution.junit.JUnitStarter.main(JUnitStarter.java:)
Caused by: java.lang.ClassNotFoundException: com.mchange.v2.ser.Indirector
    at java.net.URLClassLoader.findClass(URLClassLoader.java:)
    at java.lang.ClassLoader.loadClass(ClassLoader.java:)
    at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:)
    at java.lang.ClassLoader.loadClass(ClassLoader.java:)
    ...  more

Process finished with exit code -

 错误原因

情况1、少了一个包mchange-commons-java-0.2.11

情况2、mchange-commons-java-0.2.11包与c3p0-0.9.5.2包的版本不匹配

情况3、包的配置没有成功

解决方法

1、选择c3p0包下面的lib目录里面的包

2、将其导入进项目中

c3p0包的下载地址

https://sourceforge.net/projects/c3p0/files/latest/download