I have installed Java 8 on my machine and have started a project with it. However, when I use an #Override annotation, the code is underlined in red, and the error Syntax error, annotations are only available if source level is 1.5 or greater appears.
I have installed the released Eclipse Java Development Tools Patch with Java 8 support (for Kepler SR2), but this only adds support for new features in Java 8, and does not fix the bug with annotations.
Make sure your INSTALLED_JRE is pointing to jdk 1.8 in eclipse
Preference > java > installed_jre
Make sure java > compiler is set to 1.8 in eclipse
preference > java > compiler > compiler compliance level
If you are using maven, you can try right click the project name and run Maven/Update Project.
by default 1.4 version will set, so make sure set preference > java > compiler > compiler compliance level in eclipse IDE
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I have now a little experience in Java, so I wanted to take the next step to an IDE, so I installed the Eclipse IDE. (If it matters, I am using mac.)
But this does not seem to work right, as soon as I create a new class, the error occurs:
The project was not built due to "release 6 is not found in the
system". Fix the problem, then try refreshing this project and
building it since it may be inconsistent HelloWorld
I already tried to change some of the properties in the class or selecting different settings, right now I use the execution environment JRE: J2SE-1.5.
Thank you for taking your time!
Well it is basically telling you that you don't have the right version of Java JDK installed. THIS page seems to imply the current version of eclipse needs 1.8 - not the 1.6 you're talking about. I am unsure though how you could have specified one that isn't installed. Maybe you only have the JRE (java runtime environment). You will definitely need the JDK (java development kit) because that is what has the java compiler in it.
It's been a long time since I used eclipse but when you created the project you should have been prompted to specify the java version. Now try right clicking on the project and choose Build Path... Configure Build Path. On the Java Compiler tab (left side) you should be able to change the configured Java to whatever you have installed.
I got this error when the selected version under Preferences > Java > Compiler > Compiler compliance level was higher than the selected version under Preferences > Java > JREs > Installed JREs. There was a small (very small) warning at the top of the JREs page warning me that there was an incompatibility with the compiler compliance level.
The options for compiler compliance level includes all versions up to the version that Eclipse itself is using, even if you don't have a specific JDK with that version, so you can get warnings for JDK releases that you definitely don't have.
I updated the compiler compliance level to be the correct version for my project and that got rid of the problem.
When I click on the design tab I get this error:
Incompatible Java Versions
Eclipse is running under 1.7, but this Java project has a 1.8 Java compliance level, so WindowBuilder will not be able to load classes from this project. Use a lower level of Java for the project, or run Eclipse using a newer Java version.
I've checked in window>preferences that:
>java>compiler is set to 1.8
>java>installed JREs has a 1.8 JDK as the default
Have I missed something?
looks like JAVA_HOME is set to the java 7 one, will this require a restart?
You're actually executing eclipse with Java 7, you can update JAVA_HOME to point to Java 8, and then restart eclipse (not your computer).
I need to write an essay in computer science using java 1.6 only.
the problem that I have 1.8 installed in my computer.
is there a plugin for eclipse that show me warnings for 1.7 and 1.8 features?
thank you!
You don't need a plugin. You can set the Compliance level of the Eclipse Java compiler in the Preferences in 'Java > Compiler' (which sets the default for the whole workspace). You can also set the level in the Properties for a Project ('Java Compiler') properties.
Setting the compliance level to 1.6 will give you errors for 1.7 and 1.8 language features. However it will not warn you if you use classes and methods from the Java API which are not in 1.6 - only installing a 1.6 JDK can do that.
You can also tell Eclipse about multiple Java JRE/JDK installs in the Preferences in 'Java > Installed JREs' and then choose which one to use in each project.
I use STS, and would like to update one project only to Java 7. Its a project that I have exported from git, and uses the switch(String) statement. Can I change the JRE settings for this project alone to Java 7 in STS while keep the others running in Java 1.6? I am currently seeing the error -
Cannot switch on a value of type String for source level below 1.7. Only convertible int values or enum variables are
permitted
Can someone please throw some light?
project > right click > java > compiler > compiler compliance level > 1.7
I am using JRE version 7 with my eclipse. How do I know the compiler version which the eclipse is using ?
goto
check for jdk
windows > preference > java > installed jre
check for eclipse's compiler compliance level
windows > preference > java > compiler
It can be different for each project. Right click on the project, and go to Properties/Java Compiler.
Choose Window/Preferences/Java/Compiler to see default configuration of your IDE.
Check the project properties as well to be sure you do not have per-project configuration differ from default.