Android requires compiler compliance level 5.0 or 6.0. Found '1.7' instead. Please use Android Tools > Fix Project Properties

Question

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:

1. Right-click on your project and select "Android Tools -> Fix Project Properties" (if this din't work, try second option)
2. 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.

1. Go to the project folder and right click on it -> properties -> check off the read only box and click ok

2. Right-click on your project and select "Android Tools -> Fix Project Properties"

3. 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)

4. 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 :

1. 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

2. 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.