这个异常是什么原因引起的？求助！

Question

java.lang.NullPointerException
at com.microsoft.sqlserver.jdbc.Util.parseUrl(Unknown Source)
at com.microsoft.sqlserver.jdbc.SQLServerDriver.connect(Unknown Source)
at com.mchange.v2.c3p0.DriverManagerDataSource.getConnection(DriverManagerDataSource.java:68)
at com.mchange.v2.c3p0.WrapperConnectionPoolDataSource.getPooledConnection(WrapperConnectionPoolDataSource.java:87)
at com.mchange.v2.c3p0.impl.C3P0PooledConnectionPool$1.acquireResource(C3P0PooledConnectionPool.java:83)
at com.mchange.v2.resourcepool.BasicResourcePool.assimilateResource(BasicResourcePool.java:884)
at com.mchange.v2.resourcepool.BasicResourcePool.acquireUntil(BasicResourcePool.java:601)
at com.mchange.v2.resourcepool.BasicResourcePool.access$400(BasicResourcePool.java:31)
at com.mchange.v2.resourcepool.BasicResourcePool$AcquireTask.run(BasicResourcePool.java:1079)
at com.mchange.v2.async.ThreadPoolAsynchronousRunner$PoolThread.run(ThreadPoolAsynchronousRunner.java:354)
com.mchange.v2.resourcepool.BasicResourcePool$AcquireTask@d9367a -- Acquisition Attempt Failed!!! Clearing pending acquires.
While trying to acquire a needed new resource, we failed
to succeed more than the maximum number of allowed
acquisition attempts (30).

Answer 1

NullPointerException你的对象为null值，然后调用了它的属性或方法

Answer 2

at com.mchange.v2.c3p0.DriverManagerDataSource.getConnection(DriverManagerDataSource.java:68) 
应该在这了

Answer 3

NullPointerException 自己上谷歌查啊。

Answer 4

楼主根据提示的信息，设置断点。跟进去，里面有对象是空的。所以报空指针错误。
com.mchange.v2.c3p0.DriverManagerDataSource.getConnection(DriverManagerDataSource.java:68) 第一次报错的地方。

Answer 5

假如程序中使用了空对象，程序运行时会出现异常：NullPointerException。由于对象是动态分配实体的，所以java的编译器对空对象不做检查。因此在写程序时要避免使用空对象