Mybatis异常：MBean: com.mchange.v2.c3p0:type=PooledDataSource,identityToken=1hgedq99n9h1k

当使用Mybatis运行项目时发现Tomcat卡在了

0    INFO  [2017-04-01 08:37:28]  MLog clients using log4j logging.
344  INFO  [2017-04-01 08:37:29]  Initializing c3p0-0.9.2.1 [built 20-March-2013 10:47:27 +0000; debug? true; trace: 10]
381  DEBUG [2017-04-01 08:37:29]  MBean: com.mchange.v2.c3p0:type=PooledDataSource,identityToken=1hgedq99nat0kglijv62w|d6e4d6b,name=1hgedq99nat0kglijv62w|d6e4d6b registered.
412  DEBUG [2017-04-01 08:37:29]  MBean: com.mchange.v2.c3p0:type=PooledDataSource,identityToken=1hgedq99nat0kglijv62w|d6e4d6b,name=1hgedq99nat0kglijv62w|d6e4d6b unregistered, in order to be reregistered after update.
412  DEBUG [2017-04-01 08:37:29]  MBean: com.mchange.v2.c3p0:type=PooledDataSource,identityToken=1hgedq99nat0kglijv62w|d6e4d6b,name=1hgedq99nat0kglijv62w|d6e4d6b registered.

然后久久不能过去最后报tomcat运行超时错误

但是我已经将tomcat超时设为120s一般的项目正常运行已经足够所以这个错误时不正确的

之后经过我一点一滴的尝试发现这个问题是出在我的Mybatis的mapper.xml文件上

当时我发生这个问题的原因是因为我的 <update id="updateByPrimaryKey" 出现了2次

后续经过测试如果mapper.xml文件里面有错误的的话 mybatis并不会报出异常而是一直卡在

0    INFO  [2017-04-01 08:37:28]  MLog clients using log4j logging.
344  INFO  [2017-04-01 08:37:29]  Initializing c3p0-0.9.2.1 [built 20-March-2013 10:47:27 +0000; debug? true; trace: 10]
381  DEBUG [2017-04-01 08:37:29]  MBean: com.mchange.v2.c3p0:type=PooledDataSource,identityToken=1hgedq99nat0kglijv62w|d6e4d6b,name=1hgedq99nat0kglijv62w|d6e4d6b registered.
412  DEBUG [2017-04-01 08:37:29]  MBean: com.mchange.v2.c3p0:type=PooledDataSource,identityToken=1hgedq99nat0kglijv62w|d6e4d6b,name=1hgedq99nat0kglijv62w|d6e4d6b unregistered, in order to be reregistered after update.
412  DEBUG [2017-04-01 08:37:29]  MBean: com.mchange.v2.c3p0:type=PooledDataSource,identityToken=1hgedq99nat0kglijv62w|d6e4d6b,name=1hgedq99nat0kglijv62w|d6e4d6b registered.

注：解决方法仔细检查新加入的mapper.xml文件一定是里面出现了问题产生的

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Mybatis异常：MBean: com.mchange.v2.c3p0:type=PooledDataSource,identityToken=1hgedq99n9h1k

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