eclipse magic: … Syntax error, varargs are only available if source level is 1.5 or greater

Question

Yesterday I made a project in eclipse, and it was working, compiling. I used Eclipse Galileo for Java EE. Today I open eclipse and see lots of errors saying that stuff is no

Answer 1

Try this:

Go to your project's Properties, set the Java Compiler compliance level to 1.6, let it rebuild the project, then switched back to 1.7 and rebuild it again.

It worked for me :)

Answer 2

Single answer couldn't solve my problem so I used both :

• First right click on the error in problems tab
• click Quick fix
• ok
• right click on the project
• build path
• configure build path
• remove JRE library
• add JRE library

.... tada...done... :)

Answer 3

Perhaps your project lacks in some necessary jars. Try this:

• Right click your project>>build path>>select libraries>>add jars to add necessary jars in your project.
• Go to your project's Properties, set the Java Compiler compliance level to 1.6 or above.
• Go to your project's Properties，set the project facets. make the 'java' option to match your Java Compiler compliance level,such as '1.6'.

Answer 4

1. Open Window | Preferences.
2. Java | Compiler.
3. Change compiler compliance level to some other value.
4. Hit apply, allowing eclipse to build.
5. Change compiler compliance level to desired level of Java.

Answer 5

Just make sure Java > Installed JREs has jre6 instead of jdk1.6.0

Eclipse seems detect jdk6 as not jre 1.5+

Answer 6

See also: Eclipse: Syntax Error, parameterized types are only if source level is 1.5

(I know, I know, this question is older by a year, but the other one contains some additional info in Jeff's answer.)