oracle.net.ns.NetException:Socket read timed out update

设置的是jdbc I/O socket read and write operations的超时时间，防止因网络问题或数据库问题，导致driver一直阻塞等待。(建议比statement timeout的时间长) ，超过数据库自带设置的时间 

    @Test
	public void testReadTimeout() throws SQLException {
		Connection connection = dataSource.getConnection();
		String sql = "select * from demo_table";
		PreparedStatement pstmt;
		try {
			pstmt = (PreparedStatement)connection.prepareStatement(sql);
			ResultSet rs = pstmt.executeQuery();
			int col = rs.getMetaData().getColumnCount();
			System.out.println("============================");
			while (rs.next()) {
				for (int i = 1; i <= col; i++) {
					System.out.print(rs.getObject(i));
				}
				System.out.println("");
			}
			System.out.println("============================");
		} catch (SQLException e) {
			e.printStackTrace();
		} finally {
			//close resources
		}
	}

 

//部分数据输出......
java.sql.SQLRecoverableException: IO 错误: Socket read timed out
	at oracle.jdbc.driver.T4CPreparedStatement.fetch(T4CPreparedStatement.java:1128)
	at oracle.jdbc.driver.OracleResultSetImpl.close_or_fetch_from_next(OracleResultSetImpl.java:373)
	at oracle.jdbc.driver.OracleResultSetImpl.next(OracleResultSetImpl.java:277)
	at com.example.demo.DemoApplicationTests.testReadTimeout(DemoApplicationTests.java:68)
	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
	at java.lang.reflect.Method.invoke(Method.java:497)
	at org.junit.runners.model.FrameworkMethod$1.runReflectiveCall(FrameworkMethod.java:50)
	at org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:12)
	at org.junit.runners.model.FrameworkMethod.invokeExplosively(FrameworkMethod.java:47)
	at org.junit.internal.runners.statements.InvokeMethod.evaluate(InvokeMethod.java:17)
	at org.springframework.test.context.junit4.statements.RunBeforeTestMethodCallbacks.evaluate(RunBeforeTestMethodCallbacks.java:75)
	at org.springframework.test.context.junit4.statements.RunAfterTestMethodCallbacks.evaluate(RunAfterTestMethodCallbacks.java:86)
	at org.springframework.test.context.junit4.statements.SpringRepeat.evaluate(SpringRepeat.java:84)
	at org.junit.runners.ParentRunner.runLeaf(ParentRunner.java:325)
	at org.springframework.test.context.junit4.SpringJUnit4ClassRunner.runChild(SpringJUnit4ClassRunner.java:252)
	at org.springframework.test.context.junit4.SpringJUnit4ClassRunner.runChild(SpringJUnit4ClassRunner.java:94)
	at org.junit.runners.ParentRunner$3.run(ParentRunner.java:290)
	at org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:71)
	at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:288)
	at org.junit.runners.ParentRunner.access$000(ParentRunner.java:58)
	at org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:268)
	at org.springframework.test.context.junit4.statements.RunBeforeTestClassCallbacks.evaluate(RunBeforeTestClassCallbacks.java:61)
	at org.springframework.test.context.junit4.statements.RunAfterTestClassCallbacks.evaluate(RunAfterTestClassCallbacks.java:70)
	at org.junit.runners.ParentRunner.run(ParentRunner.java:363)
	at org.springframework.test.context.junit4.SpringJUnit4ClassRunner.run(SpringJUnit4ClassRunner.java:191)
	at org.junit.runner.JUnitCore.run(JUnitCore.java:137)
	at com.intellij.junit4.JUnit4IdeaTestRunner.startRunnerWithArgs(JUnit4IdeaTestRunner.java:69)
	at com.intellij.rt.execution.junit.JUnitStarter.prepareStreamsAndStart(JUnitStarter.java:234)
	at com.intellij.rt.execution.junit.JUnitStarter.main(JUnitStarter.java:74)
	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
	at java.lang.reflect.Method.invoke(Method.java:497)
	at com.intellij.rt.execution.application.AppMain.main(AppMain.java:144)
Caused by: oracle.net.ns.NetException: Socket read timed out
	at oracle.net.ns.Packet.receive(Packet.java:339)
	at oracle.net.ns.DataPacket.receive(DataPacket.java:106)
	at oracle.net.ns.NetInputStream.getNextPacket(NetInputStream.java:315)
	at oracle.net.ns.NetInputStream.read(NetInputStream.java:260)
	at oracle.net.ns.NetInputStream.read(NetInputStream.java:185)
	at oracle.net.ns.NetInputStream.read(NetInputStream.java:102)
	at oracle.jdbc.driver.T4CSocketInputStreamWrapper.readNextPacket(T4CSocketInputStreamWrapper.java:124)
	at oracle.jdbc.driver.T4CSocketInputStreamWrapper.read(T4CSocketInputStreamWrapper.java:80)
	at oracle.jdbc.driver.T4CMAREngine.unmarshalUB1(T4CMAREngine.java:1137)
	at oracle.jdbc.driver.T4CTTIfun.receive(T4CTTIfun.java:290)
	at oracle.jdbc.driver.T4CTTIfun.doRPC(T4CTTIfun.java:192)
	at oracle.jdbc.driver.T4C8Oall.doOALL(T4C8Oall.java:531)
	at oracle.jdbc.driver.T4CPreparedStatement.doOall8(T4CPreparedStatement.java:207)
	at oracle.jdbc.driver.T4CPreparedStatement.fetch(T4CPreparedStatement.java:1119)
	... 35 more

刚开始会有数据输出，但是到了某个resultSet的next的时候，报了超时(close_or_fetch_from_next)，这个超时指定的是当result.next方法触发新的一批数据的拉取(当一个fetchSize的数据消费完之后，接下来的next会触发新一批数据的fetch)之后在timeout时间返回内没有收到数据库返回的数据。

oracle的jdbc默认的fetchSize为10，也就是每个fetch，如果超过指定时间没接收到数据，则抛出timeout异常。

转载地址：https://juejin.im/post/6844903554172354568