我有一个带有hibernate连接的Web应用程序。应用程序正在连接到PostgreSQL数据库。有时我在日志中遇到异常。
Caused by: **org.postgresql.util.PSQLException: An I/O error occured while sending to the backend.**
at org.postgresql.core.v3.QueryExecutorImpl.execute(QueryExecutorImpl.java:283)
at org.postgresql.jdbc2.AbstractJdbc2Statement.execute(AbstractJdbc2Statement.java:479)
at org.postgresql.jdbc2.AbstractJdbc2Statement.executeWithFlags(AbstractJdbc2Statement.java:353)
at org.postgresql.jdbc2.AbstractJdbc2Statement.executeQuery(AbstractJdbc2Statement.java:252)
at org.apache.commons.dbcp.DelegatingStatement.executeQuery(DelegatingStatement.java:208)
at org.apache.commons.dbcp.DelegatingStatement.executeQuery(DelegatingStatement.java:208)
at org.geotools.jdbc.JDBCFeatureReader.<init>(JDBCFeatureReader.java:150)
at org.geotools.jdbc.JDBCFeatureSource.getReaderInternal(JDBCFeatureSource.java:567)
... 101 more
**Caused by: java.io.EOFException**
at org.postgresql.core.PGStream.ReceiveChar(PGStream.java:261)
at org.postgresql.core.v3.QueryExecutorImpl.processResults(QueryExecutorImpl.java:1620)
at org.postgresql.core.v3.QueryExecutorImpl.execute(QueryExecutorImpl.java:257)
Caused by: org.postgresql.util.PSQLException: **An I/O error occured while sending to the backend.**
at org.postgresql.core.v3.QueryExecutorImpl.execute(QueryExecutorImpl.java:283)
at org.postgresql.jdbc2.AbstractJdbc2Statement.execute(AbstractJdbc2Statement.java:479)
at org.postgresql.jdbc2.AbstractJdbc2Statement.executeWithFlags(AbstractJdbc2Statement.java:353)
at org.postgresql.jdbc2.AbstractJdbc2Statement.executeQuery(AbstractJdbc2Statement.java:252)
at org.apache.commons.dbcp.DelegatingStatement.executeQuery(DelegatingStatement.java:208)
at org.apache.commons.dbcp.DelegatingStatement.executeQuery(DelegatingStatement.java:208)
at org.geotools.jdbc.JDBCFeatureReader.<init>(JDBCFeatureReader.java:150)
at org.geotools.jdbc.JDBCFeatureSource.getReaderInternal(JDBCFeatureSource.java:567)
... 101 more
**Caused by: java.net.SocketException: Connection reset**
at java.net.SocketInputStream.read(Unknown Source)
at java.net.SocketInputStream.read(Unknown Source)
at org.postgresql.core.VisibleBufferedInputStream.readMore(VisibleBufferedInputStream.java:135)
at org.postgresql.core.VisibleBufferedInputStream.ensureBytes(VisibleBufferedInputStream.java:104)
at org.postgresql.core.VisibleBufferedInputStream.read(VisibleBufferedInputStream.java:73)
at org.postgresql.core.PGStream.ReceiveChar(PGStream.java:259)
at org.postgresql.core.v3.QueryExecutorImpl.processResults(QueryExecutorImpl.java:1620)
at org.postgresql.core.v3.QueryExecutorImpl.execute(QueryExecutorImpl.java:257)
可能是什么问题。我需要在我的hibernate配置文件或任何代码问题中更改它。请给我你的建议？
找到下面我的hibernate配置
<property name="hibernate.c3p0.min_size">5</property>
<property name="hibernate.c3p0.max_size">20</property>
<property name="hibernate.c3p0.timeout">5000</property>
<property name="hibernate.c3p0.max_statements">0</property>
<property name="hibernate.c3p0.idle_test_period">3000</property>
请在下面找到我的postgreSQL日志
2014-02-19 07:22:35 IST LOG: server process (PID 74813) was terminated by signal 6: Aborted
2014-02-19 07:22:35 IST LOG: terminating any other active server processes
2014-02-19 07:22:35 IST WARNING: terminating connection because of crash of another server process
2014-02-19 07:22:35 IST DETAIL: The postmaster has commanded this server process to roll back the current transaction and exit, because another server process exited abnormally and possibly corrupted shared memory.
2014-02-19 07:22:35 IST HINT: In a moment you should be able to reconnect to the database and repeat your command.
2014-02-19 07:22:35 IST WARNING: terminating connection because of crash of another server process
2014-02-19 07:22:35 IST DETAIL: The postmaster has commanded this server process to roll back the current transaction and exit, because another server process exited abnormally and possibly corrupted shared memory.
2014-02-19 07:22:35 IST HINT: In a moment you should be able to reconnect to the database and repeat your command.
2014-02-19 07:22:35 IST LOG: all server processes terminated; reinitializing
2014-02-19 07:22:35 IST LOG: database system was interrupted; last known up at 2014-02-19 07:22:29 IST
2014-02-19 07:22:35 IST LOG: database system was not properly shut down; automatic recovery in progress
2014-02-19 07:22:35 IST LOG: record with zero length at 0/16D89BB0
2014-02-19 07:22:35 IST LOG: redo is not required
2014-02-19 07:22:35 IST LOG: autovacuum launcher started
2014-02-19 07:22:35 IST LOG: database system is ready to accept connections
2014-02-19 11:17:59 IST LOG: unexpected EOF on client connection
2014-02-19 11:17:59 IST LOG: unexpected EOF on client connection
2014-02-19 11:17:59 IST LOG: unexpected EOF on client connection
2014-02-19 11:17:59 IST LOG: unexpected EOF on client connection
2014-02-19 11:17:59 IST LOG: unexpected EOF on client connection
2014-02-19 11:17:59 IST LOG: unexpected EOF on client connection
2014-02-19 11:17:59 IST LOG: unexpected EOF on client connection
2014-02-19 11:17:59 IST LOG: unexpected EOF on client connection
我的服务器操作系统是 - 64位红帽企业Linux 6 和postgreSQL版本 - postgreSQL 9.1
答案 0 :(得分：6)
好的，这很有趣：
2014-02-19 07:22:35 IST LOG：服务器进程（PID 74813）被信号6终止：中止
这表明PostgreSQL服务器后端正在崩溃。具体来说，信号6（SIGABRT）由断言失败触发，因为出现问题而故意丢弃代码，并且无法继续而不会有数据损坏的风险。
如果您没有运行PostgreSQL版本的最新补丁版本（您没有提及），请立即更新。
（其余的问题确实更多，但是SO的格式有时会使评论过于严格）：
我建议log_statement = all启用log_line_prefix，其中至少包含后端pid和事务ID。然后重新加载PostgreSQL以使设置处于活动状态。当问题接下来发生时，查看查询日志以查看崩溃进程在崩溃时正在执行的操作。查看是否在控制台上以交互方式运行相同的语句也会导致崩溃。
我还建议启用核心转储文件并下载PostgreSQL版本的debuginfo包。这将允许您将调试器附加到包含崩溃时服务器状态的文件，并希望看到出现了什么问题。如何启用核心转储是特定于OS /发行版的，您没有提到您的操作系统和版本，因此我无法提供更具体的说明;见谷歌。
答案 1 :(得分：0)
根据postgresql documentation，您遇到了 connection_failure 问题。请检查以下步骤，
答案 2 :(得分：0)
就我而言，此错误是由我在表上执行的截断引起的，但未提交事务。 （我使用了DBeaver工具）