I have the following dependency in my pom.xml
<dependency>
<groupId>javax.sql</groupId>
<artifactId>jdbc-stdext</artifactId>
<version>2.0</version>
<scope>system</scope>
<systemPath>${java.home}/lib/rt.jar</systemPath>
</dependency>
My problem is I'm trying to build on a Mac (10.6.4) which doesn't have an rt.jar.
Is there a different system path I should be using for doing a build on OS X? Is there a clean way to specify this in my pom.xml with out breaking the pom for developers using windows?
The equivalent to this jar is /System/Library/Frameworks/JavaVM.framework/Home/bundle/Classes/classes.jar. But as this dependency is basically a dependency to the JRE, you don't really need it.
Related
Using JNLP (javax.jnlp) in one java project, I reaized that it is not part of the normal JDK.
As it is a Maven project I would like to add it as a dependency to my POM.
The one dependency I found working is:
<dependency>
<groupId>javax.jnlp</groupId>
<artifactId>jnlp-api</artifactId>
<version>8.0</version>
<scope>system</scope>
<systemPath>${java.home}/lib/javaws.jar</systemPath>
</dependency>
But depending on a system path looks bad to me - really bad.
system is marked as deprecated here: https://maven.apache.org/guides/introduction/introduction-to-dependency-mechanism.html
Is there no other way?
Getting it from repositories as an reasonable up to date version (java 8)?
Or what would be the clean way?
I want to use missioncontrol module which is not published at maven repository and is installed with JDK. I could manually install it by mvn install like it's done in this script. But I'd prefer maven to resolve this dependency automatically.
The issue is I don't know exact version of module on each machine (assuming that JAVA_HOME is defined for every machine). And maven does not seem to automatically resolve the * placeholder:
<dependency>
<groupId>com.jrockit.mc</groupId>
<artifactId>com.jrockit.mc.common</artifactId>
<version>LATEST</version>
<scope>system</scope>
<systemPath>${env.JAVA_HOME}/lib/missioncontrol/plugins/com.jrockit.mc.common_*.jar</systemPath>
</dependency>
Is there any proper way to do this? Or is it a bad practice for some reason? Thanks.
Does your jar file name changes with java version
I cant find javax.ejb.jar in my .m2 dirctory, I need this jar for import javax.ejb.Schedule; , here is my pom file entry.
<dependency>
<groupId>javax.ejb</groupId>
<artifactId>ejb-api</artifactId>
<version>3.0</version>
<scope>provided</scope>
</dependency>
I am not sure if it will work or not, or its a right way to do things. Can some one please help to make a change in the POM file so that it downloads javax.ejb.jar into the .m2 directory.
Updated
by .m2 I mean in the repository directory in the correct folder
hierarchy (What ever it is).
Why? We have multiple sub projects (In eclipse workspace), In order to resolve dependency we use M2_REPO/path/to/the/required_library_file.jar, Now theses projects are part of code bases, Every developer download the source code, Maven download all jar to the repository directory(of the developer using any OS/Platform). This relative path from M2_REPO helps developer to have consitenat code (for eclipse project). Otherwise everyone will be adding their own path.
If it still doesn't make sense, here is what I want, Please give me an entry for POM file which download the javax.ejb.jar file into .m2 directory what ever the sub path is.
I have to include this jar in every project manually (And every developer needs to them as well from what ever directory have glassfish (C: , D:, E:, or /home/glassfish/modules/)
D:\servers\glassfish-3.1.2\glassfish3\glassfish\modules\javax.ejb.jar
where rest of the jars in each project are included as M2_REPO/path/to/jar which makes less no changes in the code base to commit.
M2_REPO/javax/ejb/ejb-api/3.0/ejb-api-3.0.jar
M2_REPO/javax/enterprise/cdi-api/1.0-SP1/cdi-api-1.0-SP1.jar
M2_REPO/javax/inject/javax.inject/1/javax.inject-1.jar
etc etc
I think I hear what you mean now :)
The maven dependency you specify
<dependency>
<groupId>javax.ejb</groupId>
<artifactId>ejb-api</artifactId>
<version>3.0</version>
<scope>provided</scope>
</dependency>
which you have in .m2/repository/javax/ueb/ejb-api/3.0/ejb-api-3.0.jar does not contain the class/interface javax.ejb.Schedule.
But you found the jar-file in your glassfish server, which does contain javax.ejb.Scheduleand its name is D:\servers\glassfish-3.1.2\glassfish3\glassfish\modules\javax.ejb.jar and now you ask how to get that into the pom?
Well, the Java EE APIs and their official jars in maven are somewhat a study in disharmony.
If you run a search on maven central you will find multiple jars containing exactly that class. You will probably note that all appserver vendors provide their own edition of every aspect of every api in every version.
You should be able to find a jar with the javax.ejb module from glassfish in version 3.1.2
http://search.maven.org/#artifactdetails|org.glassfish|javax.ejb|3.1.2|jar
in which case the dependency would be
<dependency>
<groupId>org.glassfish</groupId>
<artifactId>javax.ejb</artifactId>
<version>3.1.2</version>
<scope>provided</scope>
</dependency>
I found another artifactId here, though maven has your version too.
A (very) weird maven caching problem? Then it might work tomorrow.
<dependency>
<groupId>javax.ejb</groupId>
<artifactId>javax.ejb-api</artifactId>
<version>3.2</version>
</dependency>
Though this is a new version, for compilation it should do.
You may need to provide the repository location in your pom.xml file or in .m2/settings.xml file for the required jar to get downloaded into .m2 directory.
The dependency is declared as provided what means that the container will provide it.
What container are you using? I think Tomcat/Jetty won't provide that jar as it seems so Java EE. In that case just change the scope to compile.
<dependency>
<groupId>javax.ejb</groupId>
<artifactId>ejb-api</artifactId>
<version>3.0</version>
<scope>compile</scope>
</dependency>
More info about dependency scopes:
http://maven.apache.org/guides/introduction/introduction-to-dependency-mechanism.html#Dependency_Scope
java.lang.NoClassDefFoundError: Could not initialize class org.jfree.chart.JFreeChart
On Windows, a GUI system is always available.
Why such error still occur on Windows?
How to solve?
I use tomcat 7 with JFreeChart 1.0.14.
Please make sure you have library file of jfree in your classpath.
If you are using maven adding this dependency shall work,
<dependency>
<groupId>jfree</groupId>
<artifactId>jfreechart</artifactId>
<version>1.0.14</version>
Its not an issue of windows, make sure you are including the jar of jfreechart in your classpath, if you are using maven use
<dependency>
<groupId>jfree</groupId>
<artifactId>jfreechart</artifactId>
<version>1.0.13</version> <!--Use any valid version-->
</dependency>
If not using maven, downlaod the jar and add to your lib folder
I am using an external, proprietary jar in my project. When I hard-code the path as follows in my pom.xml, it works fine:
<dependency>
<groupId>com.foo.bar</groupId>
<artifactId>bar</artifactId>
<version>5.2</version>
<scope>system</scope>
<type>jar</type>
<systemPath>D:\workspace\myproj\external\companyname\lib\proprietary_api.jar</systemPath>
</dependency>
However, when I try to use the ${basedir} variable, maven can't find the jar:
<dependency>
<groupId>com.foo.bar</groupId>
<artifactId>bar</artifactId>
<version>5.2</version>
<scope>system</scope>
<type>jar</type>
<systemPath>${basedir}\external\companyname\lib\proprietary_api.jar</systemPath>
</dependency>
The pom is located in D:\workspace\myproj
This also needs to be cross-platform compatible (dev on Windows, deploy on Linux).
Thanks!
It is wrong to use system scope for your proprietary JARs. You should deploy or install it into the local/central repository.
I'm not sure this will help, but try using forward (/) instead of backward (\) slashes. Also, try running it with mvn -e and mvn -X (the latter will produce a lot of debugging lines) - this might help you pinpoint the problem.
Here's an example:
http://jmonkeyengine.org/groups/contribution-depot-jme3/forum/topic/maven-2-pomxml
of using ${basedir} in the same way you want.
Btw, why don't you mvn install:install-file the dependency instead of using systemPath? See:
http://maven.apache.org/plugins/maven-install-plugin/usage.html
In order to be cross-platform compatible use ${file.separator} instead of the slashes..
so that will automatically convert to OS specified format
To make it work both on windows and linux, you have to start using profiles. In that way, a particular profile will get activated based on the OS and the build will become portable.
In each profile, you can define a property called jarPath (just an example) and refer that property in your dependency.
Maven Profiles Introduction
Look into the OS tag and configuration tag of the profile. Make sure your build are always portable and less manual steps needs to be done.involved.
Use forward slashes in the path.
The ${basedir} placeholder is extrapolated only once per Maven run. If this project is not the topmost project in your project hierarchy, then ${basedir} will be extrapolated to the location of the topmost project (i.e. the project where Maven started), not the current project.