持久性单位抱怨数据源即使没有关闭

Question

我有一个持久单元，在Apache Tomee 7.0.4(Eclipselink 2.6.4(上工作，但是在升级到Tomee 7.1.0(Eclipselink 2.7.4(之后，JPA呼叫在此之后失败一段时间。persistence.xml是：

<?xml version="1.0" encoding="UTF-8"?>
<persistence version="1.0" xmlns="http://java.sun.com/xml/ns/persistence">
  <persistence-unit name="xxxPU" transaction-type="JTA">
    <exclude-unlisted-classes>false</exclude-unlisted-classes>
    <jta-data-source>xxxDB</jta-data-source>
    <properties>
      <property name="openjpa.jdbc.DBDictionary" value="mysql"/>
      <property name="openjpa.Log" value="DefaultLevel=WARN, Tool=INFO"/>
    </properties>
  </persistence-unit>
</persistence>

tome.xml中定义的数据源是

  <Resource id="xxxDB" type="javax.sql.DataSource">
        UserName = xxxx
        Password = yyyy
        JdbcDriver = com.mysql.jdbc.Driver
        JdbcUrl = jdbc:mysql://localhost/dbname
        JtaManaged = true
    factory = org.apache.tomcat.jdbc.pool.DataSourceFactory
    ConnectionProperties = autoReconnect=true;autoReconnectForPools=true;zeroDateTimeBehavior=convertToNull;useUnicode=yes;characterEncoding=UTF-8;useSSL=false
    defaultAutoCommit = false
    testOnBorrow = true
    validationQuery = SELECT 1
    validationInterval = 30000
  </Resource>

故障发生在此后的日志之后发生：

15-May-2019 19:12:49.236 SEVERE [ajp-nio-8009-exec-10] org.apache.openejb.core.transaction.EjbTransactionUtil.handleSystemException EjbTransactionUtil.handleSystemException: Exception [EclipseLink-4002] (Eclipse Persistence Services - 2.7.3.v20180807-4be1041): org.eclipse.persistence.exceptions.DatabaseException
Internal Exception: com.mysql.jdbc.exceptions.jdbc4.MySQLNonTransientConnectionException: No operations allowed after connection closed.
Error Code: 0

显然MySQL连接已关闭，但实际上不是。我有一个servlet，当http获得时，证明数据源还可以：

@Resource(name=xxxDB)
DataSource dataSource;
....
try (Connection connection = dataSource.getConnection()) {
// do a query to prove connection OK
}

我有每小时会得到这个servlet的cron工作。连接即使在JPA抛出com.mysql.jdbc.exceptions.jdbc4.mysqlnontransientConnectionException

之后，连接也可以。

我的环境Java 8，Tomee 7.1.0，Eclipselink 2.7.3

Answer 1

问题是eclipselink 2.7。我添加了这些参数：

testOnBorrow = true
testWhileIdle = true
timeBetweenEvictionRuns = 60000 millisecond
testOnReturn = true
validationQuery = SELECT 1
validationInterval = 30000

这与Apache-Tomee-Plume的封闭连接失败，但可以使用Apache-Tomee-Plus。两者都是Ver 7.1.0，只有" plus"使用openjpa，但羽流使用eclipselink。