如何解决Oracle 12c：尝试在后台线程中获取缓存的 PreparedStatement 时出现问题
我正在尝试执行从数据库表中复制数据的 sql 作业。数据库服务器是 Oracle 12c。无法找出以下异常的可能原因：
Caused by: java.sql.sqlException: A problem occurred while trying to acquire a cached PreparedStatement in a background thread.
at com.mchange.v2.c3p0.stmt.GooGooStatementCache.acquireStatement(GooGooStatementCache.java:571)
at com.mchange.v2.c3p0.stmt.GooGooStatementCache.checkoutStatement(GooGooStatementCache.java:204)
at com.mchange.v2.c3p0.impl.NewPooledConnection.checkoutStatement(NewPooledConnection.java:321)
at com.mchange.v2.c3p0.impl.NewProxyConnection.prepareStatement(NewProxyConnection.java:553)
at org.springframework.jdbc.core.PreparedStatementCreatorFactory$PreparedStatementCreatorImpl.createPreparedStatement(PreparedStatementCreatorFactory.java:238)
at org.springframework.jdbc.core.JdbcTemplate.execute(JdbcTemplate.java:632)
Caused by: java.sql.sqlException: [Oracle JDBC Driver]Object has been closed.
at sun.reflect.GeneratedMethodAccessor23.invoke(UnkNown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:498)
at com.mchange.v2.c3p0.stmt.GooGooStatementCache$1StmtAcquireTask.run(GooGooStatementCache.java:547)
at com.mchange.v2.async.ThreadPoolAsynchronousRunner$PoolThread.run(ThreadPoolAsynchronousRunner.java:696)
我尝试关注此线程 "error-occured-while-trying-to-acquire-a-cached-preparedstatement-in-a-background" 。但是我们检查了没有人关闭连接以及它是否自行关闭。我们还验证了数据库网络是否由于某种原因被加载，但没有发现。
感谢任何可以帮助我们解决此异常以找到其根本原因的建议。
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