Using Eclipse 2018.12, I've installed the Eclipse Kotlin plugin (0.8.20.20200316-1305), created a Kotlin project (using the "New..." options under "Kotlin") and wrote a "Hello World!" program:
Test.kt:
fun main() = System.out.println("Hello World!")
However, when I try to run it I get the message
Error: Could not find or load main class TestKt
Caused by: java.lang.ClassNotFoundException: TestKt
Upon further inspection it seems the class has never been compiled. There is no corresponding .class file anywhere. Under the project directory I see Eclipse configuration directory .settings and files .project and .classpath. Besides that, I have an empty bin directory and a src directory with Test.kt only.
I found two similar questions about this in SO:
In Unable to Run Kotlin Application in Eclipse, the accepted answer simply indicates working with a new version of Eclipse and Kotlin plugin, both older than what I have now. Besides, the problem may have been solved in that case due to a new installation rather than the version.
Kotlin - Error: Could not find or load main class _DefaultPackage is quite old and the accepted answer does not apply anymore. It was about not naming the main class properly, but in my case there is not even a byte code file to be found.
Running "Project -> Compile Kotlin classes" had no effect.
How can I get this simple example to run?
Update: I've updated to 2020-06 (not that it should matter since Eclipse Kotlin lists 2018-12 in its requirements) and replaced Zuly by AdoptOpenJDK HotSpotJDK 11. The error persists. The Eclipse log does not show any related messages.
Update 2: re-created the project in a brand-new workspace but the problem persists.
I'm trying to run Jhipster sample app in my Eclipse kepler . I've downloaded the project from here and I've imported it as existing maven project but it couldn't be build . I got this exception :
The type java.util.Optional cannot be resolved. It is indirectly referenced from required .class files AccountResource.java
and many "Undefined CSS file" errors
how can I run this project in my Eclipse ?
Normally you should create your application using the yeoman generator. Install yeoman and execute yo jhipster from your command line.
a)For the java exception basically you need to remove the old version of java from your build path and add support for java 8.
You need to follow these steps
1) Right-click on project » Properties » Java Build Path
2) Select Libraries tab
3) Find the JRE System Library and remove it
4) Click Add Library... button at right side » Add the JRE System Library(Workspace default JRE)
Do not forget to set the Java jdk compiler compliance level to 1.8 (Preference -> Java -> compiler )
b) The jhipster site mentions about the configuration settings(css,javascript and html etc)for eclipse to avoid errors in eclipe. https://jhipster.github.io/configuring_ide_eclipse.html
I am running Eclipse Luna on OS X with Gradle IDE 3.6.1 and anytime I try to select a project from the gradle tasks panel I get the following error:
org.eclipse.osgi.internal.framework.EquinoxConfiguration$1
Could not fetch model of type 'EclipseProject' using Gradle distribution
'https://services.gradle.org/distributions/gradle-2.0-bin.zip'.
Has anyone else run into this error? I can get to the URL specified to download the file myself. So, network connectivity shouldn't be the problem.
The problem is for the java version configured by default on the IDE (Eclipse or Spring Tool Suite). The error is the following:
To fix it, you can set the Java version supported by the Gradle version in Configure Workspace Setting option.
Finally, you can refresh your project o continue with your creation. Later all will be perfect.
I had the same error in Eclipse Neon (version numbers were different, but otherwise same error). It looks like several different things can cause this error, but for me it was an incorrect property in [MyProject]/.settings/org.eclipse.buildship.core.prefs.
I had
connection.gradle.distribution=GRADLE_DISTRIBUTION(WRAPPER)
but it needed to be
connection.gradle.distribution=GRADLE_DISTRIBUTION(VERSION(2.13))
2.13 should be replaced with whatever version number output you get from gradle -version.
Coming back to add this:
It turns out, the actual root problem was an incompatibility between Gradle versions. My build.gradle file worked fine with an old version of Gradle, but uses things that were deprecated and removed in later versions.
Solution is to click Finish immediately in the wizard instead of Next, and then fix the issues in the build.gradle.
Bad reference in config.
Overwrite configuration:
Project -> Properties -> Gradle -> Override workspace settings ->
Specific Gradle version -> 4.x
You need to update Gradle
Goto:
Select 'Help > About Eclipse' (on Macs this is 'Eclipse > About Eclipse').
Click the 'Installation Details' button to display the installation details dialog. Look in the 'Installed Software' tab to see all the installed plugins.
Search for Gradle(Eclipse Plug-ins for Gradle) and Update.
It might take some time for first time after that.
Reason why it happens, cause new version of gradle is available to download. Once you download new version of gradle, your error will go away.
http://gradle.org/downloads
I had the same error message using Eclipse 4.5
In my case the build file was having a error and I had to modify this line
eclipse.classpath {
plusConfigurations += configurations.providedCompile
}
into this
eclipse.classpath {
plusConfigurations += [configurations.providedCompile]
}
After that everything worked again.
I met the same problem, somebody suggested that the gradle project may be build by a old version.
I solve the problem by the following step:
modify the configuration in Eclipse, perfrence ->gradle ->gradle distribution . point it to an older version.
delete the file in ./gradle/wrapper
reload the program
In my case, I forgot to put ending apostrophe ' for a value
I ran into a similar issue recently - even blowing away the project and repulling a fresh copy from git didn't fix it. I realized it wasn't specific to the project when I reproduced it outside of Eclipse:
$ ./gradlew tasks
FAILURE: Build failed with an exception.
* What went wrong:
Expecting a stack map frame
Exception Details:
Location:
build_euvk0e0guiuwrf8fgn8svi2fy.run()Ljava/lang/Object; #16: aconst_null
Reason:
Error exists in the bytecode
Bytecode:
0x0000000: 2abb 0022 592a 2ab7 0025 ba00 3300 00b0
0x0000010: 01b0
What did fix it was removing the gradle cache:
$ rm -r ~/.gradle/caches
$ ./gradlew tasks
Somehow the version of gradle there had become corrupted (possibly related to Eclipse groovy plugin - I had this issue regularly until uninstalling it), and blowing it away forced it to get a fresh copy.
Hopefully this answer helps someone else avoid pulling out their hair.
I had a very similar issue and removing the following from my build.gradle fixed it. The same bit of config works in all other Gradle projects I have but for some reason not this one...
allprojects {
...
apply plugin: 'eclipse-wtp'
...
// remove this eclipse config to make the error go away
eclipse {
classpath { defaultOutputDir = file('build-eclipse') }
}
...
}
Open the CMD and enter there gradle --gui, change the settings of the gradle gui in the register Setup to Stack trace Output: Full Stack trace [-S] and the log level to info. Then change the current directory to the directory your build.gradle file is located and then go to the first register and let process the gui this files.
An error message should be displayed. There you find out what is wrong with your build.gradle file. In my case there was a folder missing and this causes this error.
This error can also be caused by a syntax error in the previous line of build.gradle. If so, the error has nothing to do with the Gradle or Eclipse version you are running. See this question
In my case i changed the Gradle version from 4.7.rc2 to4.6 and then it started to work.
I am on eclipse Oxygen (4.7.2), I was getting similar exception while importing the project and this worked for me:
While importing on windows Import Options
Click Configure Workspace Setting (which will take to preference window)
Select Local Installation directory (for me 'graddle wrapper' was selected)
apply, close and continue import
Below is the error I was getting
Loading Gradle project preview failed due to an error in the referenced Gradle build.
Could not fetch model of type 'GradleBuild' using Gradle distribution 'https://services.gradle.org/distributions/gradle-3.5-bin.zip'.
_BuildScript_
org.gradle.tooling.BuildException: Could not fetch model of type 'GradleBuild' using Gradle distribution 'https://services.gradle.org/distributions/gradle-3.5-bin.zip'.
at org.gradle.tooling.internal.consumer.ExceptionTransformer.transform(ExceptionTransformer.java:51)
at org.gradle.tooling.internal.consumer.ExceptionTransformer.transform(ExceptionTransformer.java:29)
at org.gradle.tooling.internal.consumer.ResultHandlerAdapter.onFailure(ResultHandlerAdapter.java:41)
at org.gradle.tooling.internal.consumer.async.DefaultAsyncConsumerActionExecutor$1$1.run(DefaultAsyncConsumerActionExecutor.java:57)
at Caused by: java.lang.ClassNotFoundException: _BuildScript_
at org.gradle.groovy.scripts.internal.DefaultScriptCompilationHandler$ScriptClassLoader.loadClass(DefaultScriptCompilationHandler.java:386)
... 77 more
None of the solutions worked for me and I'm having the same errors on STS 4 with eclipse Version: 2.2.600.v20190605-1800. My steps were:
Delete the project from my workspace
./gradlew cleanEclipseWtp cleanEclipse eclipseWtp eclipse
Import the project as an existing eclipse project (not an existing gradle import)
That worked!
Deleting .gradle folder from the project resolved my problem.
I got this error with Eclipse 2021-06, Java 1.8.0, gradle 4.4.
I tried deleting gradle wrapper binary folder, predefining gradle version, etc.
The thing that helped was just specifying gradle home directory and java home directory after selecting overriding workspace configuration.
Eclipse 4.4.1 broke Gradle Eclipse support with non-string values in system properties.This is fixed in the latest Gradle for the 3.6.2 release. Update your Gradle form this update-site: http://dist.springsource.com/snapshot/TOOLS/gradle/nightly
I'm running java 1.6 in Eclipse on my Intel Mac. I'm using the 1.6.0 version under System/Library/Frameworks and set the default compiler to this in Eclipse.
How do I attach the source code?
First, I downloaded the 1.6 source from oracle, thinking I could attach that 'cause the installed 1.6 didn't have source.
When I click a java class to get the Source Code Editor, there are problems:
first, the top line says Compiled from File.java (version 1.5 : 49.0, super bit)
most important, when I attach the 1.6 source jar file, it gets an error:
An error has occurred. See error log for more details.
Unable to create resource org.eclipse.ui.internal.misc.ExternalProgramImageDescriptor#50417ba8
This also appears in the error log:
java.lang.ClassNotFoundException: org.eclipse.ui.internal.views.log.LogView
at org.eclipse.osgi.internal.loader.BundleLoader.findClassInternal(BundleLoader.java:506)
The Eclipse version is: Eclipse Java EE IDE for Web Developers.
Version: Helios Service Release 2
Build id: 20110218-0911
When I click for installation details, I get:
An internal error occurred during: "Fetching children of _SELF_".
Registry Directory not available: /Users/rfrail/Downloads/eclipse 2/p2/org.eclipse.equinox.p2.engine/profileRegistry.
I'm running Eclipse from my Download directory (it's worked fine in the past); however, there are 2 folders for Eclipse:
eclipse, and
eclipse 2.
So that looks like a source of confusion right there. Eclipse operates fine otherwise.
Can you help, please?
http://java.decompiler.free.fr/ is your answer
it has an eclipse plugin which decompiles code in place