CannotGetJdbcConnectionException: java.lang.NullPointerException

[C3Stones]

When I use c3p0:0.9.5.4 version, the following error occasionally occurs. What is the reason? How can I solve it?

Caused by: org.springframework.jdbc.CannotGetJdbcConnectionException: Failed to obtain JDBC Connection; nested exception is java.sql.SQLException: An SQLException was provoked by the following failure: java.lang.NullPointerException at org.springframework.jdbc.datasource.DataSourceUtils.getConnection(DataSourceUtils.java:83) at org.springframework.jdbc.core.JdbcTemplate.execute(JdbcTemplate.java:646) at org.springframework.jdbc.core.JdbcTemplate.query(JdbcTemplate.java:713) at org.springframework.jdbc.core.JdbcTemplate.query(JdbcTemplate.java:738) at org.springframework.jdbc.core.JdbcTemplate.query(JdbcTemplate.java:794) at org.springframework.jdbc.core.namedparam.NamedParameterJdbcTemplate.query(NamedParameterJdbcTemplate.java:209) at org.springframework.jdbc.core.namedparam.NamedParameterJdbcTemplate.query(NamedParameterJdbcTemplate.java:216) ... at org.springframework.cglib.proxy.MethodProxy.invoke(MethodProxy.java:218) at org.springframework.aop.framework.CglibAopProxy$CglibMethodInvocation.invokeJoinpoint(CglibAopProxy.java:793) at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:163) at org.springframework.aop.framework.CglibAopProxy$CglibMethodInvocation.proceed(CglibAopProxy.java:763) at org.springframework.dao.support.PersistenceExceptionTranslationInterceptor.invoke(PersistenceExceptionTranslationInterceptor.java:137) at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:186) at org.springframework.aop.framework.CglibAopProxy$CglibMethodInvocation.proceed(CglibAopProxy.java:763) at org.springframework.aop.framework.CglibAopProxy$DynamicAdvisedInterceptor.intercept(CglibAopProxy.java:708) ... at sun.reflect.GeneratedMethodAccessor3115.invoke(Unknown Source) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) at java.lang.reflect.Method.invoke(Method.java:498) at org.springframework.messaging.handler.invocation.InvocableHandlerMethod.doInvoke(InvocableHandlerMethod.java:169) at org.springframework.messaging.handler.invocation.InvocableHandlerMethod.invoke(InvocableHandlerMethod.java:119) at org.springframework.kafka.listener.adapter.HandlerAdapter.invoke(HandlerAdapter.java:56) at org.springframework.kafka.listener.adapter.MessagingMessageListenerAdapter.invokeHandler(MessagingMessageListenerAdapter.java:356) at org.springframework.kafka.listener.adapter.BatchMessagingMessageListenerAdapter.invoke(BatchMessagingMessageListenerAdapter.java:180) at org.springframework.kafka.listener.adapter.BatchMessagingMessageListenerAdapter.onMessage(BatchMessagingMessageListenerAdapter.java:172) at org.springframework.kafka.listener.adapter.BatchMessagingMessageListenerAdapter.onMessage(BatchMessagingMessageListenerAdapter.java:61) at org.springframework.kafka.listener.KafkaMessageListenerContainer$ListenerConsumer.doInvokeBatchOnMessage(KafkaMessageListenerContainer.java:2398) ... 19 common frames omitted Caused by: java.sql.SQLException: An SQLException was provoked by the following failure: java.lang.NullPointerException at com.mchange.v2.sql.SqlUtils.toSQLException(SqlUtils.java:118) at com.mchange.v2.sql.SqlUtils.toSQLException(SqlUtils.java:77) at com.mchange.v2.sql.SqlUtils.toSQLException(SqlUtils.java:74) at com.mchange.v2.c3p0.impl.C3P0PooledConnectionPool.checkoutPooledConnection(C3P0PooledConnectionPool.java:694) at com.mchange.v2.c3p0.impl.AbstractPoolBackedDataSource.getConnection(AbstractPoolBackedDataSource.java:140) at org.springframework.jdbc.datasource.DataSourceUtils.fetchConnection(DataSourceUtils.java:159) at org.springframework.jdbc.datasource.DataSourceUtils.doGetConnection(DataSourceUtils.java:117) at org.springframework.jdbc.datasource.DataSourceUtils.getConnection(DataSourceUtils.java:80) ... 48 common frames omitted Caused by: java.lang.NullPointerException: null at java.util.LinkedList.get(LinkedList.java:477) at com.mchange.v2.resourcepool.BasicResourcePool.prelimCheckoutResource(BasicResourcePool.java:647) at com.mchange.v2.resourcepool.BasicResourcePool.checkoutResource(BasicResourcePool.java:554) at com.mchange.v2.c3p0.impl.C3P0PooledConnectionPool.checkoutAndMarkConnectionInUse(C3P0PooledConnectionPool.java:758) at com.mchange.v2.c3p0.impl.C3P0PooledConnectionPool.checkoutPooledConnection(C3P0PooledConnectionPool.java:685) ... 52 common frames omitted