在Liberty Profile下的OSGI中的Web Bundle中对Mongo db使用@Resource注入

Question

我想使用@Resource将Mongo数据库（com.mongodb.DB）注入OSGI Web Bundle Project。

该应用程序将部署到WebSphere Liberty Profile V8.5.5.1。

这可能做到吗？

我收到错误消息“ ....由于异常而无法获取注释：java.lang.NoClassDefFoundError”

但是，如果不使用OSGI，我可以使用在WebSphere Liberty Profile上运行的@Resource将Mongo数据库注入WAR。

下面是查找返回null。

public static final DB getMongoDB() throws NamingException {
    InitialContext ic = new InitialContext();
    DB lookup = (DB) ic.lookup("java:comp/env/mongo/testdb");
    return lookup;
}

web.xml是

<resource-env-ref>
    <resource-env-ref-name>mongo/testdb</resource-env-ref-name>
    <resource-env-ref-type>com.mongodb.DB</resource-env-ref-type>
</resource-env-ref>

server.xml是

<!-- Enable features -->
<featureManager>
    <feature>jsp-2.2</feature>
    <feature>localConnector-1.0</feature>
    <feature>jaxrs-1.1</feature>
    <feature>wab-1.0</feature>
    <feature>ejbLite-3.1</feature>
    <feature>jpa-2.0</feature>
    <feature>jdbc-4.0</feature>
    <feature>cdi-1.0</feature>
    <feature>blueprint-1.0</feature>
    <feature>jndi-1.0</feature>
    <feature>servlet-3.0</feature>
    <feature>json-1.0</feature>
    <feature>mongodb-2.0</feature>
</featureManager>
<httpEndpoint host="localhost" httpPort="29080" httpsPort="29443" id="defaultHttpEndpoint"/>

<library id="MongoLib">
    <file name="${server.config.dir}/lib/mongo-java-driver-2.11.4.jar"/>
</library>
<mongo autoConnectRetry="false" id="mongo" libraryRef="MongoLib">
    <ports>27017</ports>
</mongo>
<mongoDB databaseName="test" id="mongo" jndiName="mongo/testdb" mongoRef="mongo">
</mongoDB>

<osgiApplication id="Test.osgi.jndi.app"
    location="Test.osgi.jndi.app.eba" name="Test.osgi.jndi.app">
    <classloader commonLibraryRef="MongoLib"></classloader>
</osgiApplication>

另外，我尝试用下面的注入替换JNDI查找。 注入的资源返回null。

public class MongoServlet extends HttpServlet {
    private static final long serialVersionUID = 1L;
    @Resource (name="mongo/testdb")
    protected DB db;
}

这是OSGI清单版本

Manifest-Version: 1.0
Bundle-ManifestVersion: 2
Bundle-Name: Test.osgi.jndi.web
Bundle-SymbolicName: Test.osgi.jndi.web
Bundle-Version: 1.0.0.qualifier
Bundle-ClassPath: WEB-INF/classes
Bundle-RequiredExecutionEnvironment: JavaSE-1.6
Web-ContextPath: /Test.osgi.jndi.web
Import-Package: com.mongodb,
 javax.el;version="2.0",
 javax.servlet;version="2.5",
 javax.servlet.annotation,
 javax.servlet.http;version="2.5",
 javax.servlet.jsp;version="2.0",
 javax.servlet.jsp.el;version="2.0",
 javax.servlet.jsp.tagext;version="2.0"
Bundle-Blueprint: OSGI-INF/blueprint/*.xml

控制台：

[AUDIT   ] CWWKZ0001I: Application apps started in 0.054 seconds.
[AUDIT   ] CWWKT0016I: Web application available (default_host): http://localhost:29080/Test.osgi.jndi.web/
[AUDIT   ] CWWKZ0001I: Application Test.osgi.jndi.app started in 0.561 seconds.
[AUDIT   ] CWWKF0015I: The server has the following interim fixes installed: PI09253.
[AUDIT   ] CWWKF0011I: The server defaultServer is ready to run a smarter planet.
[WARNING ] CWNEN0046W: The com.mongodb.DB type specified on the resource-ref, resource-env-ref, or message-destination-ref with the osgi:service/mongo/testdb name in the Test.osgi.jndi.web module could not be loaded. Compatibility type checking will not be performed for this resource reference.
[WARNING ] CWNEN0049W: Resource annotations on the methods of the com.osgi.jndi.web.MongoServlet class will be ignored. The annotations could not be obtained because of the exception : java.lang.NoClassDefFoundError: javax.naming.NamingException
[WARNING ] CWNEN0047W: Resource annotations on the fields of the com.osgi.jndi.web.MongoServlet class will be ignored. The annotations could not be obtained because of the exception : java.lang.NoClassDefFoundError: javax.naming.NamingException
    at java.lang.J9VMInternals.verifyImpl(Native Method)
    at java.lang.J9VMInternals.verify(J9VMInternals.java:94)
    at java.lang.J9VMInternals.prepare(J9VMInternals.java:516)
    at java.lang.Class.getDeclaredFields(Class.java:603)
    at com.ibm.wsspi.injectionengine.InjectionProcessor.getAllDeclaredFields(InjectionProcessor.java:549)
    at [internal classes]

Answer 1

我将Mongodb Java驱动程序jar添加到Web Deployment Assembly中的Java Build Path Entry中。 java.lang.NoClassDefFoundError消失。

但是，JNDI查找返回新的异常“ ClassCastException。我为此创建了新帖子。

在WAB内运行Liberty的MongoDB的JNDI查找期间发生ClassCastException

Answer 2

我有这个错误。 可能是您定义的：私有MongoServlet mogoServlet； 我不知道为什么，但是您尝试删除此代码并替换为其他代码。 也许会没事的。 它为我工作！