I began to get errors after downloading Nodeclipse and creating a Gradle project with New Gradle Project -- sample project "Java Quickstart". Whenever I re-open Eclipse, I get this error:
"Updating Maven Dependencies" has encountered a problem. An internal
error occurred during: "Updating Maven Dependencies".
org/eclipse/m2e/core/internal/project/registry/ProjectRegistryRefreshJob$1
I have never used Maven, but I tried to investigate the error. When I try to open Preferences > Maven, or most (but not all) of its subfolders, I get:
Unable to create the selected preference page. An error occurred while
automatically activating bundle org.eclipse.m2e.core.ui (545).
I looked on Maven Central and there is no m2e folder in org/eclipse. I also looked in Eclipse/features for pom.xml files and I have folders starting with org.eclipse.m2e, but no org.eclipse.m2e.core.ui.
Edit:
I created a new workspace and got the same error message as soon as I created a New Gradle Project based on Java Quickstart sample project. I did this twice and the second time Eclipse logged an error. Some relevant lines from the stack trace:
Exception:org.osgi.framework.BundleException: Exception in org.eclipse.m2e.core.internal.MavenPluginActivator.start() of bundle org.eclipse.m2e.core
Exception:java.lang.NoClassDefFoundError: org/eclipse/m2e/core/internal/project/registry/ProjectRegistryRefreshJob$1
at org.springsource.ide.eclipse.gradle.core.wizards.NewGradleProjectOperation.createProjectContents(NewGradleProjectOperation.java:106)
First try to build your project from command line.
Enide 2015 by Nodeclipse has built-in Terminal Ctrl+Alt+T
run gradle build
or right-click build.gradle Run as -> gradle build
Then see and think
You are building with Gradle, so don't look at Maven preferences, but Gradle one.
Possibly you confused Gradle and Maven and made wrong preferences, you can try again in new workspace.
I'm having problems trying to just create a Maven project using Scala (v2.11.6) within Eclipse (Luna). The instructions here says to install both plugins below.
Maven Integration in Eclipse
m2eclipse-scala connector
Both plugins can be installed by using the m2eclipse-scala update site. So here's what I did in my first attempt.
Download Eclipse Luna (for JavaEE developers)
Install "both" plugins above by using the m2eclipse-scala update site.
When Eclipse loads up, I attempt to create a Maven project, and the archetype I want to use is Group Id=net.alchim31.maven, Artifact Id=scala-archetype-simple, Version=1.5. However, this archetype never shows up when I enter in "scala-arch" in the filter text field.
The only project I see is the one with Group Id=org.scala-tools.archetypes, Artifact Id=scala-archetype-simple, Version=1.2. When I select this archetype to use, I get a bunch of error messages in Eclipse.
error while loading ConsoleRunner, Scala signature ConsoleRunner has wrong version expected: 5.0 found: 4.1 in ConsoleRunner.class
error while loading JUnit4, Scala signature JUnit4 has wrong version expected: 5.0 found: 4.1 in JUnit4.class
error while loading Specification, Scala signature Specification has wrong version expected: 5.0 found: 4.1 in Specification.class
In my second attempt, I try to download the pre-packaged bundle (Scala IDE for Eclipse). Again, when I attempt to create a Scala Maven project, I don't see the Maven archetype for Group Id=net.alchim31.maven (only for Group Id=org.scala-tools.archetypes).
Any ideas on what I'm doing wrong here? Or where I can find a vanilla Scala Maven project to import/modify and use for my own purpose?
Here's how I got it to work. It seems all the archetypes aren't available, so based on this answer, I created a remote catalog
Before
So do this
Go to [Windows] → [Preferences] → [Maven] → [Archetypes] → Add Remote Catalog and create the catalog, then Apply
For copy-pasting:
Catalog File: http://repo1.maven.org/maven2/archetype-catalog.xml
Description: Remote Archetypes
Go back to creating a new Maven project. Select the Remote Catalog from the dropdown. It will take a few moments to gather all the archetypes. You can see the progress at the very bottom right of the IDE. When it's done, you should be able to see the archetypes
After
Create your project with groupId and artifactId and such.
Right click the project, then from the context menu [Run As] &rarr [Maven Build]. In the dialog, type clean package into the goals. The run. The project should build and run the tests.
For me at first I got an error on the build. It was because my default environment is using Java 8. I'm pretty new to Scala, so I'm not sure is there is a problem with Scala and Java 8 or not (I think it's the Scala version in the pom (2.10.0)). But what I did to get it to work was just change the Java version used in the IDE to Java 7.
Basically just go to [Windows] → [Preferenes] → [Java] → [Installed JREs] → Add → [System VM] → Next → Directory → Find the directory of the Java home (version 7) → Finish → Then in the list tick Java 7.
Then build again. It should work. Good Luck!
One point I want to add, If you are getting following error while installing the archetype showed in image 1
Can't resolve Archetype
org.glassfish.jersey.archetypes:jersey-quickstart-webapp:2.21
org.eclipse.core.runtime.CoreException: Could not resolve artifact
org.glassfish.jersey.archetypes:jersey-quickstart-webapp:pom:2.21
Image 1:
Then before procedding with the solution specified above, try to complete these steps in eclipse.
I faced the same problem and chanced upon this SO question, as well as the answer, given by #peeskillet (many thanks). I am using:
Maven 3.3.3
Eclipse Luna Scala IDE 4.0.0.-vfinal-20150305-1644-Typesafe
Scala 2.11.6
JDK 1.8
After following the steps exactly as given here, I hit a wall. When I chose the right archetype (net.alchim31.maven), I was greeted with this error:
Could not resolve artifact net.alchim31.maven:scala-archetype-simple:pom:1.5
Suspecting that the maven embedded in eclipse was acting funny, I visited [Windows] -> [Maven] -> [Installations] and added local installation of maven (whatever is set to M2_HOME in my shell). But, no luck!
Exasperated, I visited this site: Scala Doc and switched back to command-line as this page instructs. Surprisingly (to me, at least), it worked. A maven-Scala project was created in the present directory, which I could import into Eclipse.
Just so that I am not misunderstood, I am not suggesting that #peeskillet's answer is wrong. Just wanted to share another way of creating a maven-scala project on Eclipse, in case it helps someone. I have not yet understood, why Eclipse-Scala-IDE is yet to give that 'Aha' feeling.
After you have successfully created the scala-maven project as described above, you will probably see an error "Type not found: type JUnitRunner specs.scala". In that case, manually add the following XML snippet to your pom.
<dependency>
<groupId>org.specs2</groupId>
<artifactId>specs2-junit_${scala.compat.version}</artifactId>
<version>2.4.16</version>
<scope>test</scope>
</dependency>
Moreover, to avoid errors when running mvn test,
[ERROR] scalac error: bad option: '-make:transitive'
You also need to delete the following line from the pom.xml file:
<arg>-make:transitive</arg>
I got this error when update Maven Project under eclipse Eclipse Java EE IDE for Web Developers. (Version: Kepler Service Release 2)
An internal error occurred during: "Updating Maven Project".
Path must include project and resource name: /myProjectName
Thanks
rightclick project, remove maven nature (or in newer eclipse, "Maven->Disable Maven Nature")
mvn eclipse:clean (with project open in eclipse/STS)
delete the project in eclipse (but do not delete the sources)
Import existing Maven project
SOLVED THE PROBLEM
I have a maven project in which i am getting the following error. I am using eclipse IDE
An internal error occurred during: "Importing Maven projects".
Unsupported IClasspathEntry kind=4
I have followed below steps for resolving this error. The reason for this error is class path file located in your project folder.
Disable Maven Nature for your project ( If in eclipse, right click on the project --> Maven --> Disable Maven Nature).
Delete the class path file in your project folder.
Re- enable the Maven Nature Again (right click on project --> configure --> Convert to Maven Project).
Try to Maven clean, install and Run the project.
Here's a better answer: stop using eclipse.
Here's the eclipse bug page:
https://bugs.eclipse.org/bugs/show_bug.cgi?id=394042
They seem to have no interest in fixing this issue, so if you require|prefer to use the command line for projects, then really there is no fix but to quit eclipse.
I am using Eclipse, Version: Indigo Service Release 1.
My GWT version is 2.4.0. I installed everything like GWT and Maven related plugins.
I am trying to import a existing gwt-maven project. When importing, I see this dialog:
Can anyone tell me why and how to solve it?
Google is your dear friend.
By entering "no marketplace entries found to handle gwt-mavn-plugin", I got:
Error when importing Maven-GWT project ("No marketplace entries found to handle gwt-maven-plugin")
gwt-maven-plugin with Eclipse Indigo
Eclipse: Import Maven project, missing maven-gae-plugin
EDIT :
Actually I would advise you to use maven from the command line instead of using the Maven plugin in Eclipse as I had exprienced many issues with it.
From the command line, run the following commands:
To compile and install : mvn clean install
to generate eclipse project: mvn eclipse:eclipse
Afterwards, from your eclipse, import your generated project as a normal project and voila!
Hope this helps!