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
Related
I’m trying to update my JavaFX project to be compatible with JRE 13 (until now it was set up to use JRE 1.8). I’m developing with Eclipse 2020-03, using a Mac.
The first big issue I’ve had to deal with is the migration from the included JavaFX libraries in JDK 1.8 to having to import JavaFX (14) as an external package for JDK 13.
The second issue is migration from using the classpath to using the modulepath. I’m new to the module path, so what I say about it may not make sense, but my current setup now is this:
modulepath:
<list of other .jar files>
JRE System Library [Java SE 13 [13.0.2]]
JavaFX 14
<list of .jar files I downloaded, including javafx-swt, javafx.base, javafx.controls, javafx.fxml, javafx.graphics, javafx.media, javafx.swing, javafx.web>
<I created a User Library from the above listed .jar’s>
Finally, all the compiler errors are now gone (I had to recompile some of the external .jar files I downloaded so there weren’t any split packages), but when I build and run the application class nothing happens.
Checking the Mac system console, the below output seems to reference why the app is not starting, but I checked he JDK path and the referenced java executable does exist.
com.apple.xpc.launchd[1] (com.apple.xpc.launchd.domain.pid.java.40558): Failed to bootstrap path: path = /Library/Java/JavaVirtualMachines/jdk-13.0.2.jdk/Contents/Home/bin/java, error = 2: No such file or directory
What is happening here? If you need more info about my project config, comment and I can add details.
Used equinox.launcher_1.5.600.v20191014-2022 to install Eclipse IDE for Java Developers 2019-12 then invoked Eclipse and used Eclipse Marketplace to install Kotlin Plugin for Eclipse 0.8.19. I created a Kotlin project. Using Package Explorer I expanded the contents of JRE System Library.
I expected to see java.util.ArrayList be listed in order to use on
kotlin-stdlib / kotlin.collections / ArrayList . Is there some other step missing?
That listing is showing the 'modules' in the JRE. Modules were introduced in Java 9.
The 'java.util' package is in the 'java.base' module as show in this screen shot:
I'm trying to use NetBeans for a JDBC project. However, I'm getting runtime errors when I try to compile. I decided to try a "hello world" project and I couldn't get that to run also. I'm in NetBeans 9.0 with Java JDK 10.0.2.
Error Message:
Exception in thread "main" java.lang.RuntimeException:
at javaapplication2.JavaApplication2.main(JavaApplication2.java:1)
C:\Users\James\AppData\Local\NetBeans\Cache\dev\executor-snippets\run.xml:111: The following error occurred while executing this line:
C:\Users\James\AppData\Local\NetBeans\Cache\dev\executor-snippets\run.xml:68: Java returned: 1
BUILD FAILED (total time: 1 second)
xml debug:<call-java classname="#{classname}" classpath="#{classpath}" modulename="#{modulename}" modulepath="#{modulepath}">
package javaapplication2;
public class JavaApplication2 {
public static void main(String[] args) {
System.out.println("Hello");
}
}
It is very easy, your JDK version is not 100 % compatible; use version 8.2, which is the most stable for Arduino and others.
To change platforms without deleting the existing one, simply go to Tools / Java Platforms / click on the button add Platforms.
Download/install JDK major version number the same as NetBeans.
i.e. If You have NetBeans 9 version, but your JDK is version 10,So try use NetBeans 10 version... or download/install JDK 9 (the same as NetBeans).
Create new java platform for new jdk installation.
Open netbeans menubar->tools->Java Platforms->Add Platform Specify the folder that contains the Java platform as well as the sources and Javadoc needed for debugging.
Set new java platform to your project
Right click on project ->properties->Libraries->Java Platform->select the jdk version that same as NetBeans.
Select source format of your project
Right click on project ->properties->Sources->Sources/binary format->select the jdk version that same as NetBeans.
If it still give same error,Open the project properties, select the Build-Compiling, uncheck "Compile on save" and rerun the application. This will make sure all your source code becomes recompiled before running it.
i have build the project using sbt and imported into eclipse . while trying to execute from run configuration i cannot find my main class and on running the application its prompted with the following error : could not find the main class.i have installed spark-hadoop version 1.4 and scala version 2.10.6 in the local machine also changed the scala compiler version to 2.10.6 in scala ide . The same error is produced while trying build spark from eclipse using maven . Please advice..
Check if Your main class in on build path.
Project -> Properties -> Java Build Path -> Source tab
If not add appropriate folder(s).
Add the folder where classes are generated to build path -> configure build path -> java build path -> source -> "Default Output Folder" text box.
Check if you have .scala files included in compilation path.
Even if you have the source folder included, it may be possible that .scala files are not being picked up.
The following might help, I was facing the same issue and it solved the problem for me:
build path -> configure build path -> java build path -> source -> add **/*.scala in the Included section.
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>