Java OpenJPA：为什么SQL跟踪会转到System.err？

问题描述：

我已决定将System.err重定向到一个文件：

System.setErr(new PrintStream(error.log));

OpenJPA日志设置：

connectionProperties.put("openjpa.Log", "SQL=TRACE, DefaultLevel=INFO, Runtime=INFO, Tool=INFO"); 

现在，由于某种原因，不仅异常，我的SQL跟踪也会转到该文件。 知道如何将SQL跟踪重定向回控制台吗

更新：

根据建议，我尝试将OpenJPA设置为在persistence.xml中使用log4j-line：

<property name="openjpa.Log" value="log4j"/> 

<?xml version="1.0" encoding="UTF-8" ?>
<persistence xmlns="http://xmlns.jcp.org/xml/ns/persistence" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/persistence http://xmlns.jcp.org/xml/ns/persistence/persistence_2_1.xsd" version="2.1">

    <persistence-unit name="XXX" transaction-type="RESOURCE_LOCAL">
    <provider>org.apache.openjpa.persistence.PersistenceProviderImpl</provider>
        <class>...</class>

        <properties>

            <!-- Recommended to disable this property, since we do JPA Enhancement during the build. See an ant script: openJPA_enhance.xml  -->
                <property name="openjpa.RuntimeUnenhancedClasses" value="unsupported"/>

            <!-- Caching. TODO: Optimize if needed during the testing phase -->
            <!-- We shouldn't use Data cache data at this moment.  -->
                <property name="openjpa.DataCache" value="false"/>
            <!-- The QueryStatistics can be accessed via PreparedQueryCache.getStatistics(). -->
                <property name="openjpa.jdbc.QuerySQLCache" value="true(EnableStatistics=true)" />
                <property name="openjpa.QueryCompilationCache" value="true" />

            <!-- TODO: Enable for OpenJPA 4.0 - Prevents caching the sequences -->
            <!-- <property name="openjpa.jdbc.DBDictionary" value="disableAlterSeqenceIncrementBy=true" /> -->

            <!-- enforce DBCP (build in) connection pool -->
                <property name="openjpa.jdbc.DriverDataSource" value="dbcp" />

            <!-- Use LOG4J -->
            <property name="openjpa.Log" value="log4j" />  

        </properties>
    </persistence-unit>

</persistence> 

默认openJPA_enhance.xml文件：

<!DOCTYPE project>
<!-- see details: http://openjpa.apache.org/enhancement-with-eclipse.html -->
<!-- pass params:  -Dopenjpa.libs=../lib -Dbuild.dir=./build/classes -->
<project name="jpa_enhance_builder">
    <!--path id="openjpa.libs">
            <pathelement location="./lib/openjpa-all-2.3.0.jar"/>
    </path-->
    <path id="enhance.cp">
        <pathelement location="${basedir}${file.separator}${build.dir}" />
        <fileset dir="${basedir}${file.separator}${openjpa.libs}">
            <include name="**/*.jar" />
        </fileset>
    </path>
    <property name="cp" refid="enhance.cp" />
    <target name="openjpa.libs.check" unless="openjpa.libs">
        <fail message="Please set -Dopenjpa.libs in your builder configuration!" />
    </target>
    <target name="build.dir.check" unless="build.dir">
        <fail message="Please set -Dbuild.dir in your builder configuration!" />
    </target>
    <target name="enhance" depends="openjpa.libs.check, build.dir.check">
        <echo message="${cp}" />
        <taskdef name="openjpac" classname="org.apache.openjpa.ant.PCEnhancerTask">
            <classpath refid="enhance.cp" />
        </taskdef>
        <openjpac>
            <classpath refid="enhance.cp" />
            <config propertiesFile = "${basedir}/src/META-INF/persistence.xml"/>
        </openjpac>
    </target>
</project>

persistence.xml：

<property name="openjpa.Log" value="log4j"/> 

<?xml version="1.0" encoding="UTF-8" ?>
<persistence xmlns="http://xmlns.jcp.org/xml/ns/persistence" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/persistence http://xmlns.jcp.org/xml/ns/persistence/persistence_2_1.xsd" version="2.1">

    <persistence-unit name="XXX" transaction-type="RESOURCE_LOCAL">
    <provider>org.apache.openjpa.persistence.PersistenceProviderImpl</provider>
        <class>...</class>

        <properties>

            <!-- Recommended to disable this property, since we do JPA Enhancement during the build. See an ant script: openJPA_enhance.xml  -->
                <property name="openjpa.RuntimeUnenhancedClasses" value="unsupported"/>

            <!-- Caching. TODO: Optimize if needed during the testing phase -->
            <!-- We shouldn't use Data cache data at this moment.  -->
                <property name="openjpa.DataCache" value="false"/>
            <!-- The QueryStatistics can be accessed via PreparedQueryCache.getStatistics(). -->
                <property name="openjpa.jdbc.QuerySQLCache" value="true(EnableStatistics=true)" />
                <property name="openjpa.QueryCompilationCache" value="true" />

            <!-- TODO: Enable for OpenJPA 4.0 - Prevents caching the sequences -->
            <!-- <property name="openjpa.jdbc.DBDictionary" value="disableAlterSeqenceIncrementBy=true" /> -->

            <!-- enforce DBCP (build in) connection pool -->
                <property name="openjpa.jdbc.DriverDataSource" value="dbcp" />

            <!-- Use LOG4J -->
            <property name="openjpa.Log" value="log4j" />  

        </properties>
    </persistence-unit>

</persistence> 

org.apache.openjpa.persistence.PersistenceProviderImpl
...

我强烈建议使用log4j或其他日志库来处理堆栈跟踪和输出。我曾尝试使用log4j，但它破坏了openJPA增强过程（请参阅问题更新）。我可能应该开始一个与log4j相关的新线程，但我想保留我原来的问题。我发现这个问题已经解决了，所以我希望您能够控制异常。这个问题怎么了？问题解决了。1） 我使用Log4j将SQL跟踪输出重定向到控制台。2） OpenJPA增强器问题-我缺少Log4J的类路径