Java.lang.IllegalStateException: Workspace already contains a project with name

Hello all,

Sometimes when you try to import your project to eclipse from another copy of the project you have done before, you can get this type of error:

Java.lang.IllegalStateException: Workspace already contains a project with name ThiagoLeoncioService.
at com.google.common.base.Preconditions.checkState(Preconditions.java:150)
at org.eclipse.buildship.core.workspace.internal.DefaultWorkspaceOperations.includeProject(DefaultWorkspaceOperations.java:138)
at org.eclipse.buildship.core.workspace.internal.SynchronizeGradleBuildOperation.addExistingEclipseProjectToWorkspace(SynchronizeGradleBuildOperation.java:279)
at org.eclipse.buildship.core.workspace.internal.SynchronizeGradleBuildOperation.synchronizeNonWorkspaceProject(SynchronizeGradleBuildOperation.java:268)
at org.eclipse.buildship.core.workspace.internal.SynchronizeGradleBuildOperation.synchronizeGradleProjectWithWorkspaceProject(SynchronizeGradleBuildOperation.java:179)
at org.eclipse.buildship.core.workspace.internal.SynchronizeGradleBuildOperation.access$000(SynchronizeGradleBuildOperation.java:99)
at org.eclipse.buildship.core.workspace.internal.SynchronizeGradleBuildOperation$1.run(SynchronizeGradleBuildOperation.java:134)
at org.eclipse.core.internal.resources.Workspace.run(Workspace.java:2240)
at org.eclipse.core.internal.resources.Workspace.run(Workspace.java:2262)
at org.eclipse.buildship.core.workspace.internal.SynchronizeGradleBuildOperation.synchronizeProjectsWithWorkspace(SynchronizeGradleBuildOperation.java:131)
at org.eclipse.buildship.core.workspace.internal.SynchronizeGradleBuildOperation.run(SynchronizeGradleBuildOperation.java:115)
at org.eclipse.buildship.core.workspace.internal.SynchronizeGradleBuildsJob.synchronizeBuild(SynchronizeGradleBuildsJob.java:85)
at org.eclipse.buildship.core.workspace.internal.SynchronizeGradleBuildsJob.runToolingApiJob(SynchronizeGradleBuildsJob.java:73)
at org.eclipse.buildship.core.util.progress.ToolingApiJob$1.run(ToolingApiJob.java:73)
at org.eclipse.buildship.core.util.progress.ToolingApiInvoker.invoke(ToolingApiInvoker.java:62)
at org.eclipse.buildship.core.util.progress.ToolingApiJob.run(ToolingApiJob.java:70)
at org.eclipse.core.internal.jobs.Worker.run(Worker.java:56)



Solution:

1- Go to your project root folder
2-Check your build.gradle file and see if the baseName attribute is correct.
3- Check it there is a file like .project
4-Change this file for you new project name:
Eg:.
<?xml version="1.0" encoding="UTF-8"?>
<projectDescription>
        <name>ThiagoLeoncioService</name>
        <comment>Project reprocessing created by Buildship.</comment>
        <projects>
        </projects>
        <buildSpec>
                <buildCommand>
                        <name>org.eclipse.jdt.core.javabuilder</name>
                        <arguments>
                        </arguments>
                </buildCommand>
                <buildCommand>
                        <name>org.eclipse.buildship.core.gradleprojectbuilder</name>
                        <arguments>
                        </arguments>
                </buildCommand>
        </buildSpec>
        <natures>
                <nature>org.eclipse.jdt.core.javanature</nature>
                <nature>org.eclipse.buildship.core.gradleprojectnature</nature>
        </natures>
</projectDescription>

2- Check if there is any remaining git repo information from the old project. Sometimes you can
copy a project rename all your classes, but it still in sync with git repo. To check that you can run
a basic git command : 'git branch' and see if it shows old branches there.

3-To remove those git references, execute the following command:
rm -rf .git

4-Check if there is any remaining info:
 find . | grep "\.git/" | xargs rm -rf

5- Now git branch should become master again.
execute command: git branch

You should be able to import your java project to eclipse now.


Have fun and happy coding.
Thiago