Comments on: Implementing a reusable Liferay Service Without Ext or Service Builder

By: Shantanu

Shantanu — Tue, 31 Jan 2012 10:19:52 +0000

Hi Birt,
Can you please post updates for the post to work in Liferay 6.0.6?

By: Samsam

Samsam — Mon, 18 Jul 2011 02:02:03 +0000

Hello Bert,

Why is the PrincipalBean needed in this example?

eg.
HelloWorldServiceBaseImpl extends PrincipalBean

Another question, is the following annotation only way to create a reusable web service in liferay?:

@BeanReference(name = “nl.devatwork.hello.world.service.HelloWorldService.impl”)

Thanks
Sam

By: Bert Willems

Bert Willems — Tue, 05 Jul 2011 08:04:13 +0000

Hello Sam,

I haven’t done that before so I cant help you with that.

Good luck,
Bert

By: Samsam

Samsam — Tue, 05 Jul 2011 02:54:11 +0000

Bert,

How do you use Hibernate/JPA to in the HelloWorldService module? I want to use the service module to interact with mysql database, and then create a service facade for the client.

Thanks
Sam

By: Samsam

Samsam — Tue, 05 Jul 2011 01:11:28 +0000

An excellent tutorial, ever!
It works like a charm

By: Bert Willems

Bert Willems — Mon, 04 Jul 2011 07:34:56 +0000

Hello Sam,

I think you need to configure the dependency properly in your POMs, see http://maven.apache.org/guides/introduction/introduction-to-dependency-mechanism.html for details.

Bert

By: Samsam

Samsam — Mon, 04 Jul 2011 02:25:55 +0000

Hello,

After I created liferay-plugin-package.properties with the following content:

name=Hello World Service Implementation
module-group-id=nl.devatwork.service.impl
module-incremental-version=1
short-description=
change-log=
page-url=http://www.devatwork.nl
author=Dev @ Work
licenses=Free

portal-dependency-jars=hello-world-service-1.0.0-SNAPSHOT.jar

and execute mvn clean package,
It thrown the following exception:

$ mvn clean package
[INFO] Scanning for projects…
[WARNING]
[WARNING] Some problems were encountered while building the effective model for nl.devatwork.hello.world:hello-world-service-impl:war:1.0.0-SNAPSHOT
[WARNING] ‘build.plugins.plugin.version’ for org.apache.maven.plugins:maven-compiler-plugin is missing. @ nl.devatwork.hello.world:hello-world-application:1.0.0-SNAPSHOT, C:\work\hello-world-start\pom.xml, line 24, column 21
[WARNING]
[WARNING] It is highly recommended to fix these problems because they threaten the stability of your build.
[WARNING]
[WARNING] For this reason, future Maven versions might no longer support building such malformed projects.
[WARNING]
[INFO]
[INFO] ————————————————————————
[INFO] Building Dev@Work Hello World Service Implementation 1.0.0-SNAPSHOT
[INFO] ————————————————————————
Downloading: http://localhost:8081/nexus/content/repositories/thirdparty/nl/devatwork/hello/world/hello-world-service/1.0.0-SNAPSHOT/maven-metadata.xml
[WARNING] Could not transfer metadata nl.devatwork.hello.world:hello-world-service:1.0.0-SNAPSHOT/maven-metadata.xml from/to thirdparty (http://localhost:8081/nexus/content/repositories/thirdparty): Error transferring file: Connection refused: connect
Downloading: http://localhost:8081/nexus/content/repositories/thirdparty/nl/devatwork/hello/world/hello-world-service/1.0.0-SNAPSHOT/maven-metadata.xml
[WARNING] Could not transfer metadata nl.devatwork.hello.world:hello-world-service:1.0.0-SNAPSHOT/maven-metadata.xml from/to thirdparty (http://localhost:8081/nexus/content/repositories/thirdparty): Error transferring file: Connection refused: connect
Downloading: http://localhost:8081/nexus/content/repositories/thirdparty/nl/devatwork/hello/world/hello-world-service/1.0.0-SNAPSHOT/hello-world-service-1.0.0-SNAPSHOT.pom
[INFO] ————————————————————————
[INFO] BUILD FAILURE
[INFO] ————————————————————————
[INFO] Total time: 3.684s
[INFO] Finished at: Mon Jul 04 11:15:50 EST 2011
[INFO] Final Memory: 3M/55M
[INFO] ————————————————————————
[ERROR] Failed to execute goal on project hello-world-service-impl: Could not resolve dependencies for project nl.devatwork.hello.world:hello-world-service-impl:war:1.0.0-SNAPSHOT: Failed to collect dependencies for [com.liferay.portal:portal-kernel:jar:5.2.8 (provided), com.liferay.portal:portal-service:jar:5.2.8 (provided), nl.devatwork.hello.world:hello-world-service:jar:1.0.0-SNAPSHOT (provided)]: Failed to read artifact descriptor for nl.devatwork.hello.world:hello-world-service:jar:1.0.0-SNAPSHOT: Could not transfer artifact nl.devatwork.hello.world:hello-world-service:pom:1.0.0-SNAPSHOT from/to thirdparty (http://localhost:8081/nexus/content/repositories/thirdparty): Error transferring file: Connection refused: connect -> [Help 1]
[ERROR]
[ERROR] To see the full stack trace of the errors, re-run Maven with the -e switch.
[ERROR] Re-run Maven using the -X switch to enable full debug logging.
[ERROR]
[ERROR] For more information about the errors and possible solutions, please read the following articles:
[ERROR] [Help 1] http://cwiki.apache.org/confluence/display/MAVEN/DependencyResolutionException

I am wonder how can I tell the mvn package build is on my project path, rather than going to grab it from my local repository ?

Thanks
Sam,

By: Akku

Akku — Tue, 14 Jun 2011 12:59:43 +0000

Yes, that’s what you get when you post tutorials – questions over questions over issues over more issues

Nice one!

By: Ed

Ed — Tue, 31 May 2011 16:59:28 +0000

I think I found why this didn’t work for me. I am using LR 5.2 EE SP3 on Tomcat 6 which has a classloader bug: “ClassLoaderProxy does not work with Tomcat 6. This prevents a plugin portlet from using the services of another
plugin.” – http://www.liferay.com/community/forums/-/message_boards/message/4720789

By: Ed

Ed — Fri, 27 May 2011 18:21:00 +0000

I’ve been able to implement this example successfully. However, when I try to do something meaningful in my service impl like access web services through Spring’s JAX-WS org.springframework.remoting.jaxws.JaxWsPortProxyFactoryBean I can find no way to make it work. It seems that Spring can never find the WS interfaces/stubs in the Liferay runtime environment even though everything works in Maven tests. I’ve put the stubs in the service impl as a jar, as java source, in the lib\ext, in the portlet, everywhere, etc and no luck. Anybody had success doing this?