This question already has answers here:
"R cannot be resolved to a variable"? [duplicate]
(30 answers)
Closed 5 years ago.
When I try to run a java project, a message appears after it finishes to run:
R cannot be resolved to a variable
I tried to clean the project and rebuild it but the error still remains.
Check your xml files. you have an error somewhere in one of them. fix it then clean/build project.
In Android project the R class should be automatically generated after clean buid if your configuration is right.
Related
This question already has answers here:
How do I resolve ClassNotFoundException?
(28 answers)
Closed 3 years ago.
There are quite a lot similar questions regarding Eclipse exception: java.lang.ClassNotFoundException, but none of them seems work in my case.
The exception is raised during running my java program from Eclipse, with output message like this: "Caused by: java.lang.ClassNotFoundException: com.alibaba.fastjson.JSON".
I have added fastjson-1.2.62.jar in project->properties->java build path->Libraries->Classpath, so the program can build sucessfully.
How can I make the program find the fastjson library at runtime ?
Try this - under properties click "Run/Debug Settings" - pick/click the launch config you're using, and click the edit button. A window to Edit Launch Config Properties should be there.
Check the settings for Classpath.
I'm guessing that your required jar file isn't on the list there.
(Though I'm puzzled why it isn't - possibly other editing prior to this problem?)
Please let me know if this helps (or not). Cheers!
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'Building workspace' has encountered an error
(8 answers)
Closed 5 years ago.
Im using eclipse neon with maven 3.5.0.
Anytime I make some changes to the pom file and try saving it, it throws me this error. I am unable to fix it and hence unable to proceed ahead in my project.
I found a fix here: https://github.com/SeleniumHQ/selenium/issues/3895
The problem is the empty file selenium-java-3.4.0-javadoc in the javadoc file. Java cannot handle such entries currently (fixed for JDK9): https://bugs.openjdk.java.net/browse/JDK-8048990
The empty file should be removed from the javadoc file.
This question already has answers here:
Access restriction on class due to restriction on required library rt.jar?
(15 answers)
Closed 8 years ago.
I am making a new Java project in eclipse. The only problem is that I didn't even get five lines in before I got an error that reads:
Access Restriction: The type JFrame is not accessible due to restriction on
required library C:\Program Files\Java\jre8\lib\rt.jar
How do I fix this issue? Please forgive me if someone already asked a similar question. I am still a beginner.
Try removing and readding the Java System Library to your project:
Project Properties -> Build Path -> Libraries -> Remove , and then Add Library -> JRE System Library
Try closing and reopening the Dialog after removing the the Library
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java.lang.NoClassDefFoundError: android.support.v7.appcompat.R$styleable
(5 answers)
Closed 5 years ago.
I have added android-support-v7-appcompat library to my project I got this error:
"java.lang.NoClassDefFoundError: android.support.v7.appcompat.R$styleable "
then I right clicked on the android-support-v7-appcompat and unchecked "Dependency"
when I run my project, in progress bar I see
Building workspace(Sleeping)
Ok
then it gets cleaned and then the same message will be giving.
I can't upload the print screen
any ideas please
It seems that your ide do not generate R.java properly, or your dependency setting may be wrong. Recheck that you've followed the instruction in this page https://developer.android.com/tools/support-library/setup.html
I'm not familiar with eclipse. If you're sure you have the dependency work done, maybe you can try something like "clean" and then "rebuild".
This question already has answers here:
Breakpoints in JRE System Library in Eclipse
(3 answers)
Closed 8 years ago.
I have set a break point inside the java.util.ReentrantLock code to understand the functionality in eclipse. However i am getting the following error
"Unable to install breakpoint in java.util.concurrent.locks.ReentrantLock" due to missing line number attributes. Modify compiler options to generate line number attributes.
How to proceed on this ?
Update the build path of the project to use a JDK instead of JRE.
JREs do not include debug information