we work on grails and have many projects. But we have a situation that many of the projects use same lib jar files. The problems with this approach is management of libraries jar files. For example, If any of the library changes, we need to remove and copy that lib jar in every project. So how can I set external lib location for grails, so that a single lib location can be shared by different grails application.
Thanks
You can use Maven to deal with the Jar and then use the dependency resolution to get the Jar into the Grails apps.
For example if you uncomment the mavenCentral() line you can use a jar like the following:
dependencies {
runtime('com.googlecode.jslint4java:jslint4java-ant:2.0.0') {
}
}
When ever you need to upgrade the jar it is very easy to go and update this listing to the new version.
Related
i have a project where use this jar.
as i know... after build a war, at folder WEB-INF/lib must have :
mail-1.4.1.jar
activation-1.1.jar
mysql-connector-java-5.1.20.jar
but, in folder WEB-INF/lib i see two kind version of mail.jar
in that folder has mail-1.4.3.jar
why?
Run grails dependecy-report in your project, you will know which jar file or dependency is including these 2 different versions of mail then you just need to exclude it from one of the dependency in BuildConfig.groovy.
Something like following
compile('org.apache.kafka:kafka_2.10:0.8.2.1') {
excludes 'slf4j-log4j12'
}
compile("com.amazonaws:aws-java-sdk:1.9.13") {
excludes 'joda-time'
}
I'm trying to find documentation and code samples on how to add a local / non-maven jar file to my Grails 3.x project?
I found the separate thread How to add a non-maven jar to grails - but that's only to grails 2.3, and the file structure and configuration has undergone a big overhaul in 3.x.
Any help and (especially) code samples would be wonderful! The .jar is in the local project directory, and I intend to package with the .war for deployment.
Additionally, once i add the dependency, should i just be able to call it's methods from the controller & service files? or do i need to include them in those as well?
thx!
Grails 3 uses Gradle, so there's nothing Grails specific about including a local jar. It's as easy as adding a file dependency to the dependencies block of your build.gradle file.
Per the Gradle documentation on File Dependencies:
To add some files as a dependency for a configuration, you simply pass a file collection as a dependency:
dependencies {
...
compile files('libs/a.jar', 'libs/b.jar')
// or
compile fileTree(dir: 'libs', include: '*.jar')
}
The above example shows two ways to include jars that exist in a local libs/ directory; you can do either/or. The jar(s) can be anywhere on the filesystem, just make sure you point to the correct path.
To use the classes from the dependency in your application, you'll include them in your services, controllers and all other classes like you normally would. Say libs/a.jar has a class org.example.Something, you'd add an import to the top of your Grails class like so:
import org.example.Something
I use Grails 2.2.3. I have put jar file in lib directory, IDEA immediately resolved the dependency. But when I start app I get NullPointerException on class from this library. If I try it second time or more I get java.lang.NoClassDefFoundError. I found a lot of advice how to resolve this issue but none were useful in my case.
Library (mylib-1.jar) compiled in maven and added to lib dir. In BuildConfig.groovy, dependency is mentioned as:
dependencies {
compile 'com.mylib:mylib:1'
}
I tried
grails clean
grails compile --refresh-dependencies
grails refresh-dependencies
but nothing helps. In result war file I can see this library in WEB-INF/lib, but even if deploy this war I get the same error.
How can this be resolved?
You're confusing NoClassDefFoundError with ClassNotFoundException. ClassNotFoundException happens when a class you want isn't there, but you get a NoClassDefFoundError when the class is there, but a class it depends on isn't. So you're missing another jar file that this jar file depends on.
This is one of the many reasons why it's best to use dependency management instead of manually copying jar files to the lib directory. If you use a Maven repo where the jars have proper POM files, their dependencies are specified, and the resolver can download the entire tree of dependencies for you, rather than you having to find all of the jars yourself.
I was trying to add some Java Libraries (AWS SDK for Java, Apache Commons Math, etc.) to my Grails project since some of my Java source code (placed in src/java) had dependencies. By following this answer, I was able to resolve compile errors by adding the jar files to the /lib folder and add it to the build path, as answered here: Add Java Libraries to a Netbeans Grails Project
However, when I call my Java source code from my controller during runtime, it is unable to find the Java libraries that I added, showing a NoClassDefFoundError. Should I be adding something to the BuildConfig.groovy file? I'm not sure what the name convention for the jar files to be added to the dependencies.
The question you refer to is 5 years old. You should use newer resources :)
The preferred approach now is to use dependencies in BuildConfig.groovy, and let Grails (via Ivy or Maven) download the jars for you once and reuse them for various projects.
It's not always obvious what the syntax is, and I find that http://mvnrepository.com/ is a great resource. For example if you search for "commons math" and click through to http://mvnrepository.com/artifact/org.apache.commons/commons-math you'll see a few versions. Click on version 2.2 and you'll see the Maven dependency XML but you can click on the Gradle tab and it's going to be similar to what you need for Grails. So I'd add
dependencies {
compile 'org.apache.commons:commons-math:2.2'
}
and if necessary change compile to runtime, build, etc. depending on what you need the jar in the build process.
In the rare case that you do have a jar that isn't available in a Maven repo (e.g. a shared library at your company) then you can put the jar file in the lib directory. As you've seen, Grails doesn't auto-detect it (this is as of version 2.0). But you can run grails compile --refresh-dependencies to get your jar added to the classpath.
My issue turns out to be the fact that AWS Java SDK had dependencies (Apache HTTP Client) that were not installed yet and that I was unaware of.
This is what I had to configure this for my BuildConfig.groovy file
dependencies {
runtime 'org.apache.httpcomponents:httpclient:4.2.5'
runtime 'com.amazonaws:aws-java-sdk:1.4.7'
}
All the dependencies for AWS Java SDK 1.4.7 can be found here: http://mvnrepository.com/artifact/com.amazonaws/aws-java-sdk/1.4.7. All the dependencies outside of HTTP client were already installed for me, but may not be for your Grails setup.
I have an app in Grails that uses a .java to manage paypal MassPay feature. Like many .java, it needs some jars that enclose the classes that jar uses. Ok, i import that jars and the errors in the .java dissapears. But now, when I try to run the app, i receive 25 messages like this:
myapproute/grails-app/controllers/com/mycompany/widget/MassPay.java:3: package com.paypal.sdk.profiles does not exist
import com.paypal.sdk.profiles.APIProfile;
That file in the MassPay.java does not throw any error, since i imported the jar where that class is enclosed. But it doesn't allow me to run the project.
Any help? thanks.
Im using Eclipse, not NetBeans (i have read that there is a bug in Netbeans)
Adding JARs to the Eclipse project build path is not sufficient to make them visible to Grails. You need to either put them in the application's lib directory and run grails compile --refresh-dependencies or (better) if the JARs are available in a Maven-compatible repository simply declare your dependencies in BuildConfig.groovy and let Grails download the JARs itself.
Run this - it will work
grails clean