Sql java.lang.ClassCastException:com.mchange.v2.c3p0.impl.NewProxyConnection
我得到以下信息Sql java.lang.ClassCastException:com.mchange.v2.c3p0.impl.NewProxyConnection,sql,database,oracle,jdbc,Sql,Database,Oracle,Jdbc,我得到以下信息 java.lang.ClassCastException: com.mchange.v2.c3p0.impl.NewProxyConnection 当执行以下代码时。你能帮我解决这个问题吗 ComboPooledDataSource connPool = new ComboPooledDataSource(); connPool .setJdbcUrl(PropertyReader.getSystemProperty(DB_URL));
java.lang.ClassCastException: com.mchange.v2.c3p0.impl.NewProxyConnection
当执行以下代码时。你能帮我解决这个问题吗
ComboPooledDataSource connPool = new ComboPooledDataSource();
connPool .setJdbcUrl(PropertyReader.getSystemProperty(DB_URL));
connPool .setUser(PropertyReader.getSystemProperty(DB_USER));
connPool .setPassword(Decryption.getDecryptedPwd(DB_PASSWORD));
connPool .setMaxPoolSize(MAX_POOL_SIZE);
connPool .setMaxIdleTime(MAX_IDLE_TIME);
connPool .setMinPoolSize(MIN_POOL_SIZE);
connPool .setMaxAdministrativeTaskTime(15);
java.sql.Connection conn = connPool.getConnection();
oracle.sql.CLOB c = CLOB.createTemporary(conn, false, CLOB.DURATION_SESSION);
Writer writer = c.setCharacterStream(0L);
writer.write(String.valueOf(pNoListDelimited).toCharArray());
writer.flush();
writer.close();
异常堆栈跟踪
java.lang.ClassCastException: com.mchange.v2.c3p0.impl.NewProxyConnection
at oracle.sql.CLOB.createTemporary(CLOB.java:676)
at oracle.sql.CLOB.createTemporary(CLOB.java:640)
……
…..
at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:269)
at java.util.concurrent.FutureTask.run(FutureTask.java:123)
at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:651)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:676)
at java.lang.Thread.run(Thread.java:595)
您使用的是特定于Oracle的API,该API希望您的连接是特定的Oracle连接类。但是您使用的连接是c3p0代理连接,而不是Oracle连接类 如果要使用Oracle特定的api,您有以下几种选择:
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-jdbc</artifactId>
<version>4.1.3.RELEASE</version>
</dependency>
Connection nativeCon = new C3P0NativeJdbcExtractorImpl().getNativeConnection(ps.getConnection());
oracle.sql.CLOB c = CLOB.createTemporary(nativeCon, false, CLOB.DURATION_SESSION);
打开c3p0代理连接
java.sql.Connection conn = connPool.getConnection();
conn = conn.unwrap(OracleConnection.class);
确保正确关闭连接
java.sql.Connection conn = connPool.getConnection();
conn = conn.unwrap(OracleConnection.class);