javax.naming.NameNotFoundException:名称未在此上下文中绑定.找不到 [英] javax.naming.NameNotFoundException: Name is not bound in this Context. Unable to find

问题描述

我试图找出为什么我的 Web 应用程序抛出一个

I'm trying to find out why my web application throws a

javax.naming.NameNotFoundException: Name [flexeraDS] is not bound in this Context. Unable to find [flexeraDS].

当我正在从中复制配置的姊妹程序悄悄运行时.

when a sister one from which I'm copying the configuration quietly runs.

我有:

1. 通过右键单击并选择新的持久性"从 netbeans 创建一个新的持久性，我不关心我给出的实际值，但我只需要在正确的目录中创建 persistence.xml 文件.
2. 将我的 context.xml 编辑如下，与工作姊妹项目中的相匹配
3. 编辑我的 web.xml 以包含如下所示的资源数据源
4. 再次编辑我的 persistence.xml 如下，匹配与姐妹项目相同的值.
5. 将其他项目中存在的所有库添加到我的 lib 文件夹中，并将它们也从 NetBeans 添加到战争中.

context.xml

<?xml version="1.0" encoding="UTF-8"?>
<Context antiJARLocking="true" path="/PetLogin">
  <ResourceLink global="ds/flexeraDS" name="ds/flexeraDS" type="javax.sql.DataSource"/>
</Context>

web.xml

<?xml version="1.0" encoding="UTF-8"?>
<web-app ....>
<resource-ref>
        <description>DB Connection</description>
        <res-ref-name>ds/flexeraDS</res-ref-name>
        <res-type>javax.sql.DataSource</res-type>
        <res-auth>Container</res-auth>
    </resource-ref>
</web-app>

持久性.xml

<?xml version="1.0" encoding="UTF-8"?>
<persistence version="1.0"
             xmlns="http://java.sun.com/xml/ns/persistence" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
             xsi:schemaLocation="http://java.sun.com/xml/ns/persistence http://java.sun.com/xml/ns/persistence/persistence_1_0.xsd ">
    <persistence-unit name="flexerajpa">
        <provider>org.eclipse.persistence.jpa.PersistenceProvider</provider>
        <non-jta-data-source>java:/comp/env/ds/flexeraDS</non-jta-data-source>
        <properties>

            <property name="eclipselink.ddl-generation" value="create-tables" />
            <property name="eclipselink.ddl-generation.output-mode"
                      value="database" />
            <property name="eclipselink.weaving" value="static" />
            <property name="eclipselink.logging.level" value="WARNING" />
        </properties>
    </persistence-unit>
</persistence>

现在我的系统项目以某种方式设法在启动时在 apache-tomcat-7.0.40/bin/exampleDB 中创建其数据库文件夹，而我的没有创建它并抛出上述错误.

Now my syster project some-how manages to create its database folder inside apache-tomcat-7.0.40/bin/exampleDB on startup while mine doesn't create it and throws an error as above.

抛出错误的代码是我第一次连接数据库:

The code where the error is thrown is the first time I connect to the database:

EntityManager entityManager = PersistenceProvider.createEntityManager();

PersistenceProvider 类在哪里:

where the PersistenceProvider class is:

public final class PersistenceProvider
{

    private static Map<String, Object> lOptions = new HashMap<String, Object>();

    static
    {
        lOptions.put(PersistenceUnitProperties.CACHE_SHARED_DEFAULT, "false");
    }
    private static EntityManagerFactory factory = Persistence
            .createEntityManagerFactory("flexerajpa", lOptions);

    private PersistenceProvider()
    {
    }

    /**
     * @return
     */
    public static EntityManager createEntityManager()
    {
        return factory.createEntityManager();
    }

    /**
     * @return
     */
    public static Metamodel getMetamodel()
    {
        return factory.getMetamodel();
    }
}

我没有可能的原因..如果有人有任何建议.谢谢

I'm out of possible reasons for this.. if anyone has any suggestion. Thank you

推荐答案

Ok 发现 Tomcat 文件 server.xml 也必须配置，数据源才能工作.所以只需添加:

Ok found out the Tomcat file server.xml must be configured as well for the data source to work. So just add:

<Resource 
auth="Container" 
driverClassName="org.apache.derby.jdbc.EmbeddedDriver" 
maxActive="20" 
maxIdle="10" 
maxWait="-1" 
name="ds/flexeraDS" 
type="javax.sql.DataSource" 
url="jdbc:derby:flexeraDB;create=true" 
  />

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