我正在尝试在本地 Glassfish 服务器上使用声明式服务来做一个简单的 OSGi 服务。提供的插件始终处于活动状态。
我在注入使用我的服务的 servlet 时遇到了麻烦，调用 servlet 时引用为空，因为它与注入服务引用的对象不同。
我通过在我的引用设置器中放置一个断点来测试它，我看到我的服务被注入了，但是当我单击将我的 servlet 调用到我的应用程序中的按钮时，服务引用为空，因为它不是同一个对象（即获取注入 servlet_Instance #1 但调用 servlet_Instance #2 上的方法。我一定遗漏了一点细节，因为我可以在做的时候找到并使用我的服务
final BundleContext bundleContext = FrameworkUtil.getBundle(getClass()).getBundleContext();
loggingTestServiceInterface = (LoggingTestServiceInterface) bundleContext.getService(bundleContext
.getServiceReference(LoggingTestServiceInterface.class.getName()));
用于生成我的 XMLs 文件的插件：maven-scr-plugin
<plugin>
<groupId>org.apache.felix</groupId>
<artifactId>maven-scr-plugin</artifactId>
<version>1.14.0</version>
<executions>
<execution>
<id>generate-scr-scrdescriptor</id>
<goals>
<goal>scr</goal>
</goals>
</execution>
</executions>
<configuration>
<supportedProjectTypes>
<supportedProjectType>war</supportedProjectType>
<supportedProjectType>jar</supportedProjectType>
<supportedProjectType>bundle</supportedProjectType>
</supportedProjectTypes>
</configuration>
</plugin>
这是我的服务班
@Component(immediate = false, name = "Shikashi", service = {LoggingTestServiceInterface.class}, enabled = true)
public class LoggingTestService implements LoggingTestServiceInterface
{
private final LoggerUtils loggerUtils = new LoggerUtils();
public LoggingTestService()
{
}
@Activate
public void start(final BundleContext bundleContext)
{
System.out.println("StartTest Service Fune");
}
@Deactivate
public void stop()
{
System.out.println("Stop Test Service Jitensha");
}
@Modified
public void modify()
{
System.out.println("Stop Test Service onnanogo");
}
private Logger createLogger(final Class<?> clazz)
{
return Logger.getLogger(clazz);
}
@Override
public void logDebug(final Class<?> clazz, final String message)
{
logDebug(clazz, message, null);
}
@Override
public void logDebug(final Class<?> clazz, final String message, final Throwable throwable)
{
final Logger logger = createLogger(clazz);
logger.debug(message, throwable);
}
}
生成的 XML 是
<?xml version="1.0" encoding="UTF-8"?>
<components xmlns:scr="http://www.osgi.org/xmlns/scr/v1.1.0">
<scr:component enabled="true" immediate="false" name="Shikashi" activate="start" deactivate="stop" modified="modify">
<implementation class="com.sti.logging.service.LoggingTestService"/>
<service servicefactory="false">
<provide interface="com.sti.loggingservices.serviceinterface.LoggingTestServiceInterface"/>
</service>
</scr:component>
我的小服务程序是
@WebServlet(name = "Wakarimashita", urlPatterns = { "/Wakarimashita"})
@Component
public class Wakarimashita extends HttpServlet
{
private LoggingTestServiceInterface loggingTestServiceInterface;
@Override
protected void doGet(final HttpServletRequest httpServletRequest, final HttpServletResponse httpServletResponse) throws ServletException, IOException
{
// Method just to setup the Servlet to understand how it works
final String language = "language";
final String path = "/sigbud/language/";
if (httpServletRequest.getParameter(language) != null)
{
if (httpServletRequest.getParameter(language).equalsIgnoreCase("Nihongo"))
{
httpServletResponse.sendRedirect(path + "nihongo.jsp");
}
else if (httpServletRequest.getParameter(language).equalsIgnoreCase("Eigo"))
{
httpServletResponse.sendRedirect(path + "eigo.jsp");
}
else if (httpServletRequest.getParameter(language).equalsIgnoreCase("Funansugo"))
{
httpServletResponse.sendRedirect(path + "funansugo.jsp");
}
else
{
httpServletResponse.sendRedirect(path + "unknown.jsp");
}
}
else
{
super.doGet(httpServletRequest, httpServletResponse);
}
loggingTestServiceInterface.logError(getClass(), "Wakarimasen");
}
@Reference(service = LoggingTestServiceInterface.class, cardinality = ReferenceCardinality.MANDATORY, policy = ReferencePolicy.DYNAMIC)
public void bindLoggingTestServiceInterface(final LoggingTestServiceInterface loggingTestServiceInterface)
{
this.loggingTestServiceInterface = loggingTestServiceInterface;
}
public void unbindLoggingTestServiceInterface(final LoggingTestServiceInterface loggingTestServiceInterface)
{
if (this.loggingTestServiceInterface.equals(loggingTestServiceInterface))
{
this.loggingTestServiceInterface = null;
}
}
@Activate
public void start(final BundleContext bundleContext)
{
System.out.println("StartTest Service Taisho");
}
@Deactivate
public void stop()
{
System.out.println("Stop Test Service Fukutaisho");
}
@Modified
public void modify()
{
System.out.println("Stop Test Service san jyû kyû");
}
}
生成的 XML
<?xml version="1.0" encoding="UTF-8"?>
<components xmlns:scr="http://www.osgi.org/xmlns/scr/v1.1.0">
<scr:component name="com.sti.sigbud.servlet.Wakarimashita" activate="start" deactivate="stop" modified="modify">
<implementation class="com.sti.sigbud.servlet.Wakarimashita"/>
<reference name="LoggingTestServiceInterface" interface="com.sti.loggingservices.serviceinterface.LoggingTestServiceInterface" cardinality="1..1" policy="dynamic" bind="bindLoggingTestServiceInterface" unbind="unbindLoggingTestServiceInterface"/>
</scr:component>
我也尝试过，但没有运气，因为似乎没有找到我的 servlet（错误 404 - 请求的资源（）不可用。），正如 Peter Kriens 在那里写的那样：如何使用 OSGi HTTP 服务中的 OSGi 服务
所以我像这样修改了我的servlet：
@Component(service = Servlet.class, property = {"alias=/Wakarimashita"})
public class Wakarimashita extends HttpServlet
生成的 XML 是
<?xml version="1.0" encoding="UTF-8"?>
<components xmlns:scr="http://www.osgi.org/xmlns/scr/v1.1.0">
<scr:component name="com.sti.sigbud.servlet.Wakarimashita" activate="start" deactivate="stop" modified="modify">
<implementation class="com.sti.sigbud.servlet.Wakarimashita"/>
<service servicefactory="false">
<provide interface="javax.servlet.Servlet"/>
</service>
<property name="alias" value="/Wakarimashita"/>
<reference name="LoggingTestServiceInterface" interface="com.sti.loggingservices.serviceinterface.LoggingTestServiceInterface" cardinality="1..1" policy="dynamic" bind="bindLoggingTestServiceInterface" unbind="unbindLoggingTestServiceInterface"/>
</scr:component>
我从我的 JSP 访问 servlet
<form action="Wakarimashita" method="GET">
<input type="text" name="language" size="50"/>
<input type="submit" value="Submit" />
</form>
为了测试上述内容，我在我部署的包 org.apache.felix.http.api-2.2.1、org.apache.felix.http.whiteboard-2.2.1 中进行了测试，就像在帖子中一样。没查到有没有开关。
我还检查了 org.apache.felix.webconsole-4.2.0-所有捆绑包，服务已经启动并运行，它说我的消费者捆绑包正在使用它。