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J
Jakolcz
Level 3
October 16, 2015
Solved

Get DataSourcePool for use in servlet

  • October 16, 2015
  • 18 replies
  • 5497 views

I'm trying to get DataSourcePool instance for servlet in OSGi bundle but the standard approach doesn't work. I used to get DataSourcePool via Activator like this

public class Activator implements BundleActivator { private DataSourcePool source; public void start(BundleContext context) throws Exception { ServiceReference dspRef = context.getServiceReference(DataSourcePool.class.getName()); source = (DataSourcePool)context.getService(dspRef); } public static DataSourcePool getDataSourcePool(){ return source; } }

but since I started to develop in Eclipse, this doesn't work anymore. I have this project structure in Eclipse

project-default project-default-bundle \src \main \java \cz \package \sub1 \sub2 \Activator.java \other \package \servlets \MyServlet.java project-default-components project-default-content

When I try to get the DataSourcePool in MyServlet.java, the return value from cz.package.Activator.getDataSourcePool(); is null. I also tried to use @Reference but it just gives me HTTP 403 Forbidden error after compiling and running the servlet.

Thanks for any help

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    Best answer by Jakolcz

    OK, so after a lot of googling I've found the cause and solution of this problem. The problem is with JDK7 Version 51.0 and above. Oracle added new functionality which adds StackMapTable to the bytecode and I guess that by using the SCR annotations the maven messes the bytecode so it can't be read properly. Temporary solution is to run CQ with this parameter

    -XX:-UseSplitVerifier

    but it looks like this will be deprecated in Java 8 and removed in upcoming versions.

    So from my point of view it looks like 

    • I have to wait until proper version of SCR anotations plugin or Maven will be released
    • I can use older JDK to compile my source code

    Am I right? Or is there something else that I don't see?

    18 replies

    smacdonald2008
    smacdonald2008
    Level 10
    October 16, 2015

    I have successfully injected a DataSourcePool into a Sling Servlet. I can post CQ data to the Sling Servlet - which then uses the DataSourcePool and persists the submitted data into MySQL. Here is a pic of the CQ app. Notice submitted data is persisted in MySQL:

    [img]SlingPersist.png[/img]

    I will get this article posted by the weekend. The URL will be posted on this thread.

    J
    JakolczAuthor
    Level 3
    October 16, 2015

    justin_at_adobe wrote...

    You need to look for a block that looks like this:

    1. <plugin>
    2. <groupId>org.apache.felix</groupId>
    3. <artifactId>maven-scr-plugin</artifactId>
    4. <version>1.7.4</version>
    5. <executions>
    6. <execution>
    7. <id>generate-scr-descriptor</id>
    8. <goals>
    9. <goal>scr</goal>
    10. </goals>
    11. </execution>
    12. </executions>
    13. </plugin>

     

     

    Thank you!

      J
      Adobe Employee
      JustinEd3Adobe Employee
      Adobe Employee
      October 16, 2015

      You need to look for a block that looks like this:

      <plugin> <groupId>org.apache.felix</groupId> <artifactId>maven-scr-plugin</artifactId> <version>1.7.4</version> <executions> <execution> <id>generate-scr-descriptor</id> <goals> <goal>scr</goal> </goals> </execution> </executions> </plugin>
        J
        JakolczAuthor
        Level 3
        October 16, 2015

        justin_at_adobe wrote...

        This was fixed in version 1.9.0 of the maven-scr-plugin. See https://issues.apache.org/jira/browse/FELIX-3568

         

        Thanks for that! I didn't know I'm not using the newest version of maven-scr-plugin. I'm actually using version 1.7.4 but how can I download newer version? This is what I have in my pom.xml file

        <dependency> <groupId>org.apache.felix</groupId> <artifactId>org.apache.felix.scr.annotations</artifactId> <version>1.9.6</version> <scope>provided</scope> </dependency>

        but when I run maven build it still says that it uses version 1.7.4. How can I use newer version? (I'm newbie with Maven).

          J
          JakolczAuthor
          Level 3
          October 16, 2015

          Scott Brodersen wrote...

          The Felix docs use a slightly different syntax for the Properties annotation:

           

          @Properties({@Property(name = "prop1", value = "value1"),@Property(name = "prop2", value = "value2")})

           

          edit: linky http://felix.apache.org/documentation/subprojects/apache-felix-maven-scr-plugin/scr-annotations.html :)

           

          I've changed it to this, but I still get the HTTP 403 Forbidden...

            smacdonald2008
            smacdonald2008
            Level 10
            October 16, 2015

            Nice pickup - i am using an older JDK version - jdk1.6.0_18. This is why I did not experience any issues. I will add this note to the articles so other people do not run into this issue. 

            J
            Adobe Employee
            JustinEd3Adobe Employee
            Adobe Employee
            October 16, 2015

            This was fixed in version 1.9.0 of the maven-scr-plugin. See https://issues.apache.org/jira/browse/FELIX-3568

              Scott_Brodersen
              Scott_Brodersen
              Level 8
              October 16, 2015

              The Felix docs use a slightly different syntax for the Properties annotation:

               

              @Properties({@Property(name = "prop1", value = "value1"),@Property(name = "prop2", value = "value2")})

               

              edit: linky http://felix.apache.org/documentation/subprojects/apache-felix-maven-scr-plugin/scr-annotations.html :)

                J
                JakolczAuthor
                Level 3
                October 16, 2015

                Scott Brodersen wrote...

                Is your servlet path listed in the Sling Servlet Resolver (org.apache.sling.servlets.resolver.SlingServletResolver) service?

                 

                scott

                 

                Hi, yes it is. I have the path /myservices/ set there.

                  smacdonald2008
                  smacdonald2008
                  Level 10
                  October 16, 2015

                  In the article -- we are not using a Sling Servlet - but a plain old Java Interface and Java class wrapped in an OSGi bundle. The Injection of the DataSourcePool is occuring in the Java Class that extends our custom Java interface. 

                  Can you try this and see if you have better success. We do not know if your issue is with the Servlet or the injection of the DataSourcePool. 

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