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vishnu_jangid
vishnu_jangid
October 1, 2022
Question

Embed Same jar in two different bundles

  • October 1, 2022
  • 3 replies
  • 257 views

Hello community,

 

I want to add a dependency specifically webp-imageio-sejda in my current project (project A), for this jar to be available to my bundle I have to embed it. In my AEM instance there already exist a bundle (project B) which  already contains the same dependency and it is also embedded into that bundle. 

Project A pom.xml :

 

..... <Embed-dependency> webp-iamgeio </Embed-dependency> ...... <dependencies> <!-- https://mvnrepository.com/artifact/org.sejda.imageio/webp-imageio --> <dependency> <groupId>org.sejda.imageio</groupId> <artifactId>webp-imageio</artifactId> <version>0.1.6</version> <scope> provided </scope> </dependency> </dependencies>

 

 

 

Project B pom.xml

 

..... <Embed-dependency> webp-iamgeio </Embed-dependency> ...... <dependencies> <!-- https://mvnrepository.com/artifact/org.sejda.imageio/webp-imageio --> <dependency> <groupId>org.sejda.imageio</groupId> <artifactId>webp-imageio</artifactId> <version>0.1.6</version> <scope> provided </scope> </dependency> </dependencies>

 



The problem is when I deploy my bundle (Project A) and run any service which is using a class (WebPWriteParam) from  webp-imageio-sejda I am facing an error 

 

 

java.lang.ClassCastException: class com.luciad.imageio.webp.WebPWriteParam cannot be cast to class com.luciad.imageio.webp.WebPWriteParam

 

 

This is because I have same JAR embedded in two different bundles. (Project A and Project B). I cannot Edit the POM of Project B.

Any idea How can I resolve this issue.

 

One solution I found that I can upload jar as an bundle and use that in both the bundles without embedding but I cannot edit the POM in the second bundle to remove embedding.

Thanks

 

@joerghoh @smacdonald2008 @arunpatidar @sham_hc @niall_o_donovan @lokesh_shivalingaiah 

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3 replies

Jagadeesh_Prakash
Community Advisor
Jagadeesh_PrakashCommunity Advisor
Community Advisor
October 2, 2022

@vishnu_jangid Once try removing the embed from project A. Ideally the project A and B are getting deployed in the same instance so it should work. 

 

If this is not working let me know how you have embed the values and in which module did you do it

    vishnu_jangid
    vishnu_jangidAuthor
    October 2, 2022

    Hello @jagadeesh_prakash,

     

    Its not working because I have not exported the library package from project B. 

    In core module I am added dependency with provided scope and added the library into <Embed-dependency>

    you can check pom file above in description.

     

     

    Thanks

      Jagadeesh_Prakash
      Community Advisor
      Jagadeesh_PrakashCommunity Advisor
      Community Advisor
      October 3, 2022

      @vishnu_jangid  I did not get the point. Even if you add it in the core module it is on the same instance that it is getting installed right? 

       

      I did this for one of the project and it worked for me, But i embeded it in "all" module. Please refer to below URL which gives you a clear idea

       

      https://myaemlearnings.blogspot.com/2021/08/embedding-third-party-dependencyosgi.html

       

        Shubham_borole
        Community Advisor
        Shubham_boroleCommunity Advisor
        Community Advisor
        October 3, 2022

        Hi @vishnu_jangid , wanted to check, in case you tried adding project B dependency in A, for core and all modules? Is project B an AEM project installed in same instance?

         

        In all module, for a similar set up we have embedded project B as well

         

        <embedded>
                                    <groupId>com.project.b</groupId>
                                    <artifactId>b.core</artifactId>
                                    <type>jar</type>
                                    <target>/apps/b-packages/application/install</target>
                                </embedded>
          vishnu_jangid
          vishnu_jangidAuthor
          October 3, 2022

          Hello @shubham_borole Project B is an AEM project installed on same instance. Also if I include Project B in my project core module as JAR, I will not be able to access the embedded JAR(webp-imageio)'s classes.

          Thanks

            vishnu_jangid
            vishnu_jangidAuthor
            October 3, 2022

            Thanks @vishnu_jangid , have you by chance explored https://www.albinsblog.com/2017/11/javalangclasscastexception-for-same-class.html ?

             

            I have done something similar for org.apache.commons.io and specified a version

             

            <Export-Package> org.apache.commons.io.*;version=2.11.0</Export-Package>

            Hello @shubham_borole I have tried <Export-Package>, <Private-Package>, <Embed-Dependency> almost everything but getting the same error everytime.

            Thanks

              vishnu_jangid
              vishnu_jangidAuthor
              October 9, 2022

              Hello all, Thanks for your positive response. I have found a solution for my issue.

               

              The problem was in obtaining writer. The ServiceRegistry keep records of all service providers ie the implementations of ImageWriter class. In my case the WebPWriter is registered twice as I have embedded the JAR in two bundles, so when I am getting the writer as below I am getting two writers [I thought I will get one writer as the others will be not reachable as per OSGI concept], one which is loaded from classloader of Project A and one which is loaded from classloader of Project B.

               

              When I use the writer loaded with classloader of Project B I am getting the exception.

               

              // Obtaining a WebP ImageWriter instance
ImageWriter writer = ImageIO.getImageWritersByMIMEType("image/webp").next();


              For resolving this issue, I have just changed the way of getting writer. I have iterated over list of writer and used writer which is loaded by my current bundle's classloader. 

              // Obtain a WebP ImageWriter instance
ImageWriter webPWriter = null;
Iterator<ImageWriter> writers = ImageIO.getImageWritersByMIMEType("image/webp");

while(writers.hasNext()){
    ImageWriter tempWriter = writers.next();
    
    // MyClass is class in which I am writing this method
    if(tempWriter.getClass().getClassLoader() == MyClass.class.getClassLoader()){
        webPWriter = tempWriter;
        break;
    }
}

               


              Please suggest if you have any better approach.
              Thanks

               

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