Accessing an entity of a project in another

Question

Let's say I have JProjectOne and JProjectTwo. Will the public class I have in JProjectOne be visible in JProjectTwo or do I have to do some tweaking for it to be visible?

"Projects" are not a concept that the Java Language knows about - that's just your IDE doing things its way. Before Java9, public classes were visible to any other class. Since Java9, with modules, there are some changes to that. — Erwin Bolwidt, May 28 '18 at 05:53
As long, as JProjectTwo doesn't have JProjectOne in its classpath, nothing from the latter is accessible to the former — Lino, May 28 '18 at 05:53

score 1 · Answer 1 · answered May 28 '18 at 05:50

1

private hides from other classes within the package. public exposes to classes outside the package. A protected member is accessible within all classes in the same package and within sub classes in other packages. May be JAVA Docs is helpful.

answered May 28 '18 at 05:50

Junaid Subhani

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Arun Sudhakaran · Accepted Answer · 2018-05-28T11:30:36.910

0

This is the place where JARs come handy, make a jar file of the public class you want in other project. Then add it to present project.

Creating a JAR - How to make an executable jar file?
How to add external JARs to a project - How to import a jar in Eclipse

edited May 28 '18 at 11:30

answered May 28 '18 at 06:15

Arun Sudhakaran

2,167
4
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score 0 · Answer 3 · answered May 28 '18 at 06:46

As Arun suggested try with jar, but if You are using Maven, that is quiet easy to do that, here is an example:

Here is how You could "install", send you jar file to .m2 (maven container),

mvn install:install-file
   -Dfile=<path-to-file>
   -DgroupId=<group-id>
   -DartifactId=<artifact-id>
   -Dversion=<version>
   -Dpackaging=<packaging>
   -DgeneratePom=true

Where: <path-to-file>  the path to the file to load
   <group-id>      the group that the file should be registered under
   <artifact-id>   the artifact name for the file
   <version>       the version of the file
   <packaging>     the packaging of the file e.g. jar

so this is how would this look like (example):

mvn install:install-file -Dfile=c:\test_0.0.1.jar -DgroupId= com.test
-DartifactId=project -Dversion=0.0.1 -Dpackaging=jar

...and simply calling in other project like this (also from maven):

<dependency>
    <groupId>com.test</groupId>
    <artifactId>project</artifactId>
    <version>1.0</version>
    <scope>system</scope>
    <systemPath>${project.basedir}/src/main/resources/yourJar.jar</systemPath>
</dependency>

and just do always pom.xml import on file, to update it and You're good to go. This is just local jar importing.

Hope this helps.

Accessing an entity of a project in another

3 Answers3