Actually, after I created the Project in Eclipse, I created a Java class, but it showed an error:
The type java.lang.Object cannot be resolved. It is indirectly referenced from required .class files.
I don't know how to resolve this error.
BTW, I have properly installed JDK v1.8 on my computer.
So, please can anyone resolve this problem?
Using twirl for generating template class. Everything is working fine with sbt and the webpages are rendering.
I am using Scala-IDE for development. And in the Scala-IDE the reference to the template class i.e. "html.test()", test is the template name, is showing as an error.
This is the error:
Description Resource Path Location Type
missing or invalid dependency detected while loading class file 'test.class'.
Could not access term api in value .twirl, because it (or its dependencies) are missing.
Check your build definition for missing or conflicting dependencies. (Re-run with -Ylog-classpath to see the problematic classpath.) A full rebuild may help if 'test.class' was compiled against an incompatible version of .twirl. ApiService.scala /api/src/main/scala/com/komma/api/rest line 97 Scala Problem.
I did a clean and it is giving "not found: value html" error now.
Is there any way to resolve this error in the scala IDE ?
Thanks.
Re-running sbt eclipse added target/scala-2.11/twirl/main as a source folder which resolved the compilation errors for me.
For my twirl configuration, sbt eclipse did not add the twirl output directory as a source folder. Adding
target/scala-2.11/twirl/main to the eclipse project build path through the Add Folder button, under Java Build Path, by hand, was my solution.
I am trying to compile Orbeon Forms in IntelliJ IDEA 14.0.1 Community Edition, but I am getting compile errors.
Checked out the branch origin/4.7-ce
Opened the project with IntelliJ
Got on error: Load error: undefined path variables. MESSAGE is undefined. Fix it
Fixed the MESSAGE error by entering C:\temp as the value. I don't know if this matters.
Installed the Scala and File Watchers plugins
Configured the Java SDK as jdk1.7.0_09
Removed the scala-sdk that was referencing non-existent scala compiler, library, reflect jars in my $USER_HOME\.ivy2\cache directory.
Installed the Scala 2.10.3 SDK and configured as a library in the project.
Make Project
Got 94 errors, all related to the util and xml packages. I would have expected the packages to be scala.util and scala.xml.
Example errors:
orbeon-forms\src\main\scala\org\orbeon\oxf\common\PEVersion.scala
Error:(34, 8) object Try is not a member of package util<br/>
import util.Try
orbeon-forms\src\main\scala\org\orbeon\oxf\fb\AlertsAndConstraintsOps.scala<br/>
Error:(46, 9) type mismatch;<br/>
found : scala.xml.Elem<br/>
required: org.orbeon.saxon.om.NodeInfo<br/>
toXML currentLang<br/>
What am I doing wrong?
I was able to fix this error by changing the import from:
import util.Try to import scala.util.Try
There were other files that had the same issue with the scala.xml package.
The full list of files I changed is:
src\main\scala\org\orbeon\oxf\common\PEVersion.scala
src\main\scala\org\orbeon\oxf\fr\mongodb\MongoDBPersistence.scala
src\main\scala\org\orbeon\oxf\fr\process\ProcessInterpreter.scala
src\main\scala\org\orbeon\oxf\fr\process\SimpleProcess.scala
src\main\scala\org\orbeon\oxf\fr\process\XFormsActions.scala
src\main\scala\org\orbeon\oxf\xforms\action\XFormsAPI.scala
src\main\scala\org\orbeon\oxf\xforms\analysis\ElementAnalysis.scala
src\main\scala\org\orbeon\oxf\xforms\analysis\PathMapXPathAnalysis.scala
src\main\scala\org\orbeon\oxf\xforms\control\controls\XFormsInputControl.scala
src\main\scala\org\orbeon\scaxon\XML.scala
src\test\scala\org\orbeon\oxf\common\VersionTest.scala
I check out solr to eclipse, but got the compilation error:
The method setXIncludeAware(boolean) is undefined for the type DocumentBuilderFactory
Does anyone know what's wrong ? Thanks
Jeff Zhang
javax.xml.parsers.DocumentBuilderFactory.class
is included in JRE 1.6 and also in xml-apis-1.0.b2.jar.
The version in the jar is from an older version. Remove the dependency on the jar and see what happens.
I successfully implemented and ran several Scala tutorials in Eclipse using the Scala plugin. Then suddenly I tried to compile and run an example, and this error came up:
Exception in thread "main" java.lang.NoClassDefFoundError: hello/HelloWorld
Caused by: java.lang.ClassNotFoundException: hello.HelloWorld
at java.net.URLClassLoader$1.run(URLClassLoader.java:200)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(URLClassLoader.java:188)
at java.lang.ClassLoader.loadClass(ClassLoader.java:315)
at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:330)
at java.lang.ClassLoader.loadClass(ClassLoader.java:250)
at java.lang.ClassLoader.loadClassInternal(ClassLoader.java:398)
After this point I could no longer run any Scala programs in Eclipse. I tried cleaning and rebuilding my project, closing and reopening my project, and closing and reopening Eclipse.
Eclipse version number 3.5.2 and Scala plugin 2.8.0
Here is the original code:
package hello
object HelloWorld {
def main(args: Array[String]){
println("hello world")
}
}
If you see this when you attempt to run as a Scala application then the most likely explanation is that your project didn't compile and no class files were generated. Please check whether or not that's the case: look in your project's output folder for hello/HelloWorld.class.
If your project didn't compile that could either be because there's an error which you've missed (and if this error isn't being reported in the Problems view that could be a bug, in which case please open a ticket on Trac) or because you've turned off automatic builds and not done a manual build of your project.
I had the same problem. Project doesn't compile but there are no errors highlighted and AFAIK the code is OK. It seems to be a problem with the Run Configurations.
Solution 1: Delete the existing Run Configuration for your object and create a new one
Solution 2: Create a new object and cut / paste all your code into that file
When running "clean" does not un-hose Eclipse, I next try saving my work, exiting Eclipse, and re-starting. That usually gets things going again, but not always. A few times I've had to update the Scala plugin with a more recent version (I'm using the latest nightly), to get things working again. I doubt that this worked because the new plugin happened to fix the bug, but rather expect that loading the new plugin gives the whole Eclipse-Scala
system a "total reset" that gets it unhosed.
I was getting this problem in a project that combined .java & .scala files.
The solution for me was:
Remove all .java files
Edit the scala code as needed so it compiles without them.
Add the .java files back in.
Edit the scala code back.
The other solutions given here didn't work for me. I tried: clean project, restarting Eclipse, closing-&-opening the project, creating a new .scala file. No joy.
I'm using Eclipse 3.7 (latest stable), Scala IDE 2.0.0 and Scala 2.9 on Ubuntu Linux 11.10.
The symptoms in my case were:
My project was working, but then it stopped compiling for no apparent reason. The IDE didn't show any compilation errors for .scala files, but there were no .class files in the output directory & I got a NoClassDefError if I tried to run anything.
If I created a deliberate error in a .scala file, that did get picked up as a compilation error.
The .java files were registering errors due to the missing scala classes.
I suppose there's probably a boot-strapping bug somewhere in the IDE plugin for .java/.scala mixes. I've done hybrid projects with this setup without problems, so it's only triggered in some situations. I don't know what the trigger is, but once triggered, there's no nice solution.
I had moved my one and only class/object/application to a package, but had not added the package declaration.
sbt compiled and ran fine; eclipse would not
Adding the package declaration at the top of the file fixed it.
Scala 2.8.3 plugin; no compile error
I encountered this error too but after doing the suggestions here (cleaning, deleting Run Configuration etc), I realized that I set the workspace wrongly that is why the class is not being found.
An indication that this is a problem is when the same error occurs when you try to compile a java project.
I encountered this error (compilation worked in sbt but failed in eclipse) when I created a new package object called "common". Deleting the package object in eclipse caused the compile error to go away. There was nothing in it.
I was using sbt-eclipse to build the eclipse project. I'm using scala eclipse 3.0.0-vfinal-20130326-1146-Typesafe.