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 try to run my program using IntelliJ it says I need a project SDK but when I try to set up a project SDK, it says "The Selected directory is not a valid home for this SDK"
This can happen when a java SDK is deleted, moved, or configured incorrectly.
Go into Project Structure (Ctrl+Alt+Shift+s)
On the left under Project Settings select Project
Now see the Project SDK: - it is likely red if cofigured incorrectly or it might say <No SDK>.
Firstly, just see if there is another SDK of appropriate java version in the drop down list you can use.
If not, you can use Edit button on an existing JDK to modify the JDK home path if it is wrong.
Or just press New... and JDK to set up a JDK that is already installed on your machine (e.g. C:\Program Files\Java\jdk1.8.0_72)
...if you have no JDK on your machine (be aware of the difference between a JRE and a JDK) then you'll obviously need to download and install that first
I wanted to start learning java but Eclipse is giving me some trouble.
First of all I'm a beginner with Java with little to no knowledge about it. I want to use 'JavaSe-1.7'. I have no clear reason to use it besides using the latest version. After downloading Eclipse (Eclipse IDE for Java Developers) I created a new Java project and selected 'use an execution eviorment JRE : JavaSE-1.7'. This directly popped the notification saying 'The default compiler compliance level for the current workspace is 1.6. The new project will use a project specific compiler compliance level of 1.7.'. I finished creating the project and started following some tutorials.
However I noticed directly I have 2 errors which dont explain anything or have a source. I ignored it and started typing and tried to import 'java.io.console' however it said 'The import java.io cannot be resolved' and I have no idea what is the cause of it neither how to fix this.
Would like some instructions into the right direction.
Thanks in advance
Check your Eclipse preferences: Java -> Installed JREs. The one that you're using should be marked and it should be a JDK not just a JRE.
Also check your project's build path: Right click on the project -> Properties -> Java Build Path
Check in the "libraries" folder whether the JRE System Library is present and if not add it using "Add library"->"JRE System Library" and then select the correct one (from an installed JDK).
You may not have your JDK/JRE set up correctly.
Check the following:
Did you install a JDK or just the JSE? The JDK is needed to compile .java files to .class files. Without it, you can only run java programs, not develop them. If not, download and install it from Oracle website.
Check in Eclipse, if you have the JRE installed there as well. You just need to specify the path to the installation. You can reach this screen via the "Window->Prefrences" menu. see this screenshot:
The message you receive about project specific compiler compliance level is not a problem, it just means that your workspace is set up to comply to java 1.6 but your project will comply to java 1.7 standards. Also, Java 7 in general is no problem whatsoever.
Paths may differ, especially if you're not running a *nix OS. Just point the location to where you installed your JDK.
I'm extremely confused about how to set up Java on Eclipse. I don't get how classpath/system variables/etc all works. I set my Java compiler settings from 1.7 to 1.6 after I uninstalled 1.7 (I still have 1.6). But it's still not working. Any help?
Open Eclipse. Follow Project => Properties => Java Build Path.
Come onto Libraries tab and on the right hand side you will see some buttons, click Add Library.
Select JRE System Library and click "Next" button. By clicking on Installed JREs button you will see the JREs that your Eclipse recognizes. If the JRE version is not visible there, you can use "Add" button to add a new JRE, and make sure you set the path of new JRE correctly. Sample path on my machine: C:\Program Files (x86)\Java\jre6
Probably you have to set up classpath: http://javarevisited.blogspot.com/2011/01/how-classpath-work-in-java.html, or may be you have only JRE (not JDK)?
Did anybody have similar problem with this, I import android project and I get
errors like
[2011-10-03 17:20:09 - Screen] Android requires compiler compliance level 5.0 or 6.0. Found '1.7' instead. Please use Android Tools > Fix Project Properties.
[2011-10-03 17:21:55 - App] Android requires compiler compliance level 5.0 or 6.0. Found '1.7' instead. Please use Android Tools > Fix Project Properties.
[2011-10-03 17:21:59 - App] Android requires compiler compliance level 5.0 or 6.0. Found '1.7' instead. Please use Android Tools > Fix Project Properties.
I got errors to delete all #Override above functions. I have Windows 7 x64, jvm7 x64. Does anyone have clue what is wrong ?( I done Android Tools -> Fix Project Properties but didn;t help )
That isn't the problem, Jack. Android SDK isn't x64, but works ok with x64 jvm (and x64 eclipse IDE).
As helios said, you must set project compatibility to Java 5.0 or Java 6.0.
To do that, 2 options:
Right-click on your project and select "Android Tools -> Fix
Project Properties" (if this din't work, try second option)
Right-click on your project and select "Properties -> Java
Compiler", check "Enable project specific settings" and select
1.5 or 1.6 from "Compiler compliance settings" select box.
Go to the project folder and right click on it -> properties -> check off the read only box and click ok
Right-click on your project and select "Android Tools -> Fix Project Properties"
Right-click on your project and select "Properties -> Java Compiler", check "Enable project specific settings" and select 1.5 or 1.6 from "Compiler compliance settings" select box. (try all the levels one by one just in case)
Under Window -> Preferences -> Java -> Compiler, set Compiler compliance level to 1.6 or 1.5.
Hopefully it will settle the problem.
I would recommend using x86 version of jvm. When I first got my new laptop (x64), I wanted to go x64 all the way (jvm, jdk, jre, eclipse, etc..). But once I finished setting everything up I realized that the Android SDK wasn't x64, so I had issues. Go back to x86 jvm and you should be ok.
EDIT: 11/14/13
I've seen some recent activity and figured I would elaborate a little more.
I did not say it would not work with x64, I just recommended using x86.
Here is a good post on the advantages / disadvantages of x64 JDK. Benefits of 64bit Java platform
Thought process: To what end? Why am I trying to using 64 bit JDK? Just because I have a 64-bit OS? Do I need any of the features of 64-bit JDK? Are there any extra features in the 64-bit JDK?! Why won't this s*** play nice together!? F*** it I'm going 32-bit.
Doing Project -> Clean... fixed it for me.
My eclipse had stopped working so I cleaned workspace directory and after I run eclipse when I import the project I had this problem. Other solutions suggested here didn't work.
For most of the people still receiving the error after fixing project properties, you probably installed Java 7 SDK when setting up your environment, but it is not currently supported for Android development.
As the error message sais, you should have installed Java 5.0 or 6.0, but Java 7 was found.
If you fix project properties without first installing Java 5 or 6, you will see the same error again.
So first, ensure you have Java SDK 5 or 6 installed, or install it.
Check your environment variable (JAVA_HOME) is pointing to SDK 5/6.
And then:
Check that Eclipse is using SDK 5/6 by default (Window => Prefs. => Java => Compiler
Disable Project Specific Settings (Project Properties => Java Compiler)
Fix Project Properties
OR
Leave Eclipse using JDK 7 by default.
Enable Project Specific Settings (Project Properties => Java Compiler)
Select Compiler Compliance 1.5 or 1.6 (Project Properties => Java Compiler)
I agree with BMSAndroidDroid and Flo-Scheild-Bobby. I was doing a tutorial called DailyQuote and had used the Cordova library. I then changed my OS from Windows to Ubuntu and tried to import projects into Eclipse, (I'm using Eclipse Juno 64-bit, on Ubuntu 12.04 64-bit, Oracle JDK 7. I also installed the Ubuntu 32-bit libs- so no issues with 64 and 32bit), and got the same issue.
As suggested by Flo-Scheild-Bobby, open configure build path and add the jar(s) again that you added before. Then remove the old jar link(s) and thats it.
I fixed this problem employing the two procedures of :
In Eclipse->'Project' menu -> 'Java Compiler' -> set 'Compiler compliance level' = 1.6
check on 'Use default compliance settings'
Set 'Generated .class compatibility' = 1.6
Set 'Source compatibilty' = 1.6
Then go to 'Windows' menu --> 'Preferences' -->'Java' , expand 'Java' --> 'Compiler' -->Set 'Compiler compliance level' = 1.6
Hint: Source compatibility must be equal to or less than compliance level.
I would suggest that u check for the jar files are properly included in your projects. There are possibility that in absence of jar files, the project will not be compiled
As BMSAndroidDroid said, this problem may be caused by a wrong build path configuration.
If you included some libraries to your build path, then move the libraries, the build path will conserve the wrong references, will not found the libraries during compilation and you will get an error.
To fix it, right click on your project folder > build path > configure build path
Then take a look to the library tab, and remove the old libraries.
In my case a switch from openjdk7 to openjdk6 helped. Afterwards I changed the compliance level to 1.6 and all compiled fine.
i come across this problem cause my debug.keystore is expired, so i deleted the debug.keystore under .android folder, and the eclipse will regenerate a new debug.keystore, then i fixed th
Following worked for me
Enable project-specific settings and set the compliance level to 1.6
How can you do that?
In your Eclipse Package Explorer 3rd click on your project and select properties. Properties Window will open. Select Java Compiler on the left panel of the window. Now Enable project specific settings and set the Complier compliance level to 1.6. Select Apply and then OK.