[英]shared c3p0 connection pool with hibernate and mysql on tomcat
我在一個項目中工作,我想在tomcat上使用hibernate配置一個共享連接池。 該項目已經實施,我必須對其進行更改。 它配置有hibernate和c3p0連接池 ,其中所有jar都位於項目本身中。
我將所有用於連接池的jar文件復制到了tomcat的lib文件夾中。
在server.xml中,我做了一個資源
<Resource auth="Container"
description="DB Connection"
driverClass="com.mysql.jdbc.Driver"
maxPoolSize="40"
minPoolSize="10"
acquireIncrement="1"
name="jdbc/test"
user="admin"
password="root"
factory="org.apache.naming.factory.BeanFactory"
type="com.mchange.v2.c3p0.ComboPooledDataSource"
jdbcUrl="jdbc:mysql://localhost:3306/testDB" />
<ResourceLink
global="jdbc/test"
name="jdbc/test"
type="javax.sql.DataSource" />
之后,我可以在phpmyadmin(mysql)中看到由池創建的連接。
在我的項目的web.xml文件中,我創建了一個資源引用。
<resource-ref>
<description>DB Connection</description>
<res-ref-name>jdbc/testDB</res-ref-name>
<res-type>javax.sql.DataSource</res-type>
<res-auth>Container</res-auth>
</resource-ref>
`
還有我的hibernate.cfg.xml文件
</hibernate-configuration>
<property name="dialect">org.hibernate.dialect.MySQLDialect</property>
<property name="connection.datasource">java:comp/env/jdbc/testDB</property>
<mapping resource="Database.hbm.xml"/>
</hibernate-configuration>
那就是我到目前為止所做的。 我的問題是。 在我的項目中,我有一個sessionfactory,其中設置了hibernate.cfg.xml和Database.hbm.xml文件。 現在,這給了我一個java.lang.NullPointerException 。
我是否也必須在tomcat上將sessionfactory配置為資源?
在Tomcat上:
Jun 29, 2017 10:06:19 AM org.apache.catalina.mbeans.GlobalResourcesLifecycleListener createMBeans
SCHWERWIEGEND: Exception processing Global JNDI Resources
javax.naming.NamingException: Could not load resource factory class [Root exception is java.lang.ClassNotFoundException: myutil.hibernate.HibernateSessionFactoryTomcatFactory]
at org.apache.naming.factory.ResourceFactory.getObjectInstance(ResourceFactory.java:82)
at javax.naming.spi.NamingManager.getObjectInstance(Unknown Source)
at org.apache.naming.NamingContext.lookup(NamingContext.java:842)
at org.apache.naming.NamingContext.lookup(NamingContext.java:153)
at org.apache.naming.NamingContextBindingsEnumeration.nextElementInternal(NamingContextBindingsEnumeration.java:117)
at org.apache.naming.NamingContextBindingsEnumeration.next(NamingContextBindingsEnumeration.java:71)
at org.apache.naming.NamingContextBindingsEnumeration.next(NamingContextBindingsEnumeration.java:34)
at org.apache.catalina.mbeans.GlobalResourcesLifecycleListener.createMBeans(GlobalResourcesLifecycleListener.java:138)
at org.apache.catalina.mbeans.GlobalResourcesLifecycleListener.createMBeans(GlobalResourcesLifecycleListener.java:145)
at org.apache.catalina.mbeans.GlobalResourcesLifecycleListener.createMBeans(GlobalResourcesLifecycleListener.java:110)
at org.apache.catalina.mbeans.GlobalResourcesLifecycleListener.lifecycleEvent(GlobalResourcesLifecycleListener.java:82)
at org.apache.catalina.util.LifecycleSupport.fireLifecycleEvent(LifecycleSupport.java:117)
at org.apache.catalina.util.LifecycleBase.fireLifecycleEvent(LifecycleBase.java:90)
at org.apache.catalina.util.LifecycleBase.setStateInternal(LifecycleBase.java:402)
at org.apache.catalina.util.LifecycleBase.setState(LifecycleBase.java:347)
at org.apache.catalina.core.StandardServer.startInternal(StandardServer.java:732)
at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:150)
at org.apache.catalina.startup.Catalina.start(Catalina.java:689)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
at java.lang.reflect.Method.invoke(Unknown Source)
at org.apache.catalina.startup.Bootstrap.start(Bootstrap.java:321)
at org.apache.catalina.startup.Bootstrap.main(Bootstrap.java:455)
Caused by: java.lang.ClassNotFoundException: myutil.hibernate.HibernateSessionFactoryTomcatFactory
at java.net.URLClassLoader.findClass(Unknown Source)
at java.lang.ClassLoader.loadClass(Unknown Source)
at java.lang.ClassLoader.loadClass(Unknown Source)
at org.apache.naming.factory.ResourceFactory.getObjectInstance(ResourceFactory.java:80)
... 23 more
Jun 29, 2017 10:06:17 AM org.apache.tomcat.util.digester.Digester endElement
WARNUNG: No rules found matching 'Server/GlobalNamingResources/ResourceLink'.
Jun 29, 2017 10:06:17 AM org.apache.catalina.core.AprLifecycleListener init
INFORMATION: The APR based Apache Tomcat Native library which allows optimal
performance in production environments was not found on the java.library.path:
編輯
我沒有提到的是,IAM使用OSGI晝夜平分線和Servlet橋。 我配置的所有內容都是正確的,在這種情況下,我唯一需要更改的就是更改我的launch.ini :
osgi.parentClassloader=app
osgi.contextClassLoaderParent=app
更改為
osgi.parentClassloader=app
osgi.contextClassLoaderParent=fwk <--- changed
在comp解決我的問題之前也使用斜杠使用java:/ comp / env / jdbc / testDB
在server.xml中更改為:
<Resource auth="Container"
description="DB Connection"
driverClass="com.mysql.jdbc.Driver"
maxPoolSize="40"
minPoolSize="10"
acquireIncrement="1"
name="jdbc/testDB" <!-- change -->
user="admin"
password="root"
factory="org.apache.naming.factory.BeanFactory"
type="com.mchange.v2.c3p0.ComboPooledDataSource"
jdbcUrl="jdbc:mysql://localhost:3306/testDB" />
和:
<ResourceLink
global="jdbc/testDB" <!--change -->
name="jdbc/testDB" <!-- & change -->
type="javax.sql.DataSource" />
然后將您的hibernate.cfg.xml文件
<hibernate-configuration>
<session-factory>
<property name="dialect">org.hibernate.dialect.MySQLDialect</property>
<property name="connection.datasource">java:comp/env/jdbc/testDB</property> <!-- ? -->
<mapping resource="Database.hbm.xml"/>
</session-factory>
</hibernate-configuration>
重新啟動卡塔利娜。
osgi.parentClassloader=app
osgi.contextClassLoaderParent=app
更改為
osgi.parentClassloader=app
osgi.contextClassLoaderParent=fwk <--- changed
這是我遇到NoInitialContextException時從我那里得到幫助的鏈接。
javax.naming.NoInitialContextException:Cannot instantiate class: org.apache.naming.java.javaURLContextFactory (root cause classnotfound for org.apache.naming.java.javaURLContextFactory)
還使用java:/ comp / env / jdbc / testDB代替java:comp / env / jdbc / testDB ( / comp之前的斜杠)解決了我在linux tomcat服務器上遇到的另一個問題(JNDI查找異常):
NameNotFoundException.
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