psqlexception：此连接已关闭-Spring Boot+AWS RDS+Postgres

Question

在尝试访问AWS RDS中的Postgres数据库时，我正在获取psqlexception：此连接已关闭。异常是随机发生的（不是我运行代码的所有时间），如果在执行到达下面的代码之前需要一段时间，则更有可能发生：

@Transactional
public void revokeChanges(ArrayList<Integer> changeIds) {
    jdbcTemplate.batchUpdate(sqlUpdate,
            new BatchPreparedStatementSetter() {
                @Override
                public void setValues(PreparedStatement ps, int i) throws SQLException {
                    ps.setStuff..
                    ...
                }
                @Override
                public int getBatchSize() {
                    return changeIds.size();
                }
            });
    jdbcTemplate.batchUpdate(sqlInsert,
            new BatchPreparedStatementSetter() {
                @Override
                public void setValues(PreparedStatement ps, int i) throws SQLException {
                    ps.setStuff...
                }
                @Override
                public int getBatchSize() {
                    return changeIds.size();
                }
            });

连接材料：

spring.datasource.url=jdbc:postgreSQL：//my-url：port/dbname？tcpkeepalive=true&autoreconnect=true

spring.datasource.driver-class-name=org.postgresql.driver

相关POM：

<parent>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-parent</artifactId>
    <version>1.1.9.RELEASE</version>
</parent>

<dependencies>
    <dependency>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter</artifactId>
    </dependency>
    <dependency>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-jdbc</artifactId>
    </dependency>
    <dependency>
        <groupId>org.postgresql</groupId>
        <artifactId>postgresql</artifactId>
        <version>9.3-1102-jdbc41</version>
    </dependency>

org.springframework.jdbc.support.MetaDataAccessException: Error while extracting DatabaseMetaData; nested exception is org.postgresql.util.PSQLException: This connection has been closed.
    at org.springframework.jdbc.support.JdbcUtils.extractDatabaseMetaData(JdbcUtils.java:296)
    at org.springframework.jdbc.support.JdbcUtils.extractDatabaseMetaData(JdbcUtils.java:320)
    at org.springframework.jdbc.support.SQLErrorCodesFactory.getErrorCodes(SQLErrorCodesFactory.java:214)
    at org.springframework.jdbc.support.SQLErrorCodeSQLExceptionTranslator.setDataSource(SQLErrorCodeSQLExceptionTranslator.java:134)
    at org.springframework.jdbc.support.SQLErrorCodeSQLExceptionTranslator.(SQLErrorCodeSQLExceptionTranslator.java:97)
    at org.springframework.jdbc.support.JdbcAccessor.getExceptionTranslator(JdbcAccessor.java:99)
    at org.springframework.jdbc.core.JdbcTemplate.execute(JdbcTemplate.java:660)
    at org.springframework.jdbc.core.JdbcTemplate.execute(JdbcTemplate.java:673)
    at org.springframework.jdbc.core.JdbcTemplate.batchUpdate(JdbcTemplate.java:989)
    at my.package.DataServiceJdbc.revokeChanges(DataServiceJdbc.java:71)
    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:483)
    at org.springframework.aop.support.AopUtils.invokeJoinpointUsingReflection(AopUtils.java:317)
    at org.springframework.aop.framework.ReflectiveMethodInvocation.invokeJoinpoint(ReflectiveMethodInvocation.java:190)
    at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:157)
    at org.springframework.transaction.interceptor.TransactionInterceptor$1.proceedWithInvocation(TransactionInterceptor.java:98)
    at org.springframework.transaction.interceptor.TransactionAspectSupport.invokeWithinTransaction(TransactionAspectSupport.java:262)
    at org.springframework.transaction.interceptor.TransactionInterceptor.invoke(TransactionInterceptor.java:95)
    at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:179)
    at org.springframework.aop.framework.JdkDynamicAopProxy.invoke(JdkDynamicAopProxy.java:207)
    at com.sun.proxy.$Proxy24.revokeChanges(Unknown Source)
    at my.package.DataExporterS3ToPostgre.exportData(DataExporterS3ToPostgre.java:59)
    at my.package.Application.main(Application.java:41)
    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:483)
    at com.intellij.rt.execution.application.AppMain.main(AppMain.java:134)
Caused by: org.postgresql.util.PSQLException: This connection has been closed.
    at org.postgresql.jdbc2.AbstractJdbc2Connection.checkClosed(AbstractJdbc2Connection.java:843)
    at org.postgresql.jdbc4.Jdbc4Connection.getMetaData(Jdbc4Connection.java:54)
    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:483)
    at org.apache.tomcat.jdbc.pool.ProxyConnection.invoke(ProxyConnection.java:126)
    at org.apache.tomcat.jdbc.pool.JdbcInterceptor.invoke(JdbcInterceptor.java:109)
    at org.apache.tomcat.jdbc.pool.DisposableConnectionFacade.invoke(DisposableConnectionFacade.java:80)
    at com.sun.proxy.$Proxy23.getMetaData(Unknown Source)
    at org.springframework.jdbc.support.JdbcUtils.extractDatabaseMetaData(JdbcUtils.java:285)
    ... 29 common frames omitted

Answer 1

看起来DB和池之间的连接丢失了。尝试设置RemoveAbanded和removeAbandonedTimeout选项。有关这些选项的更多数据，请阅读JDBC连接池文档。