java build path problems

Question

From someone's project, I am getting this error:

Java Build Path Problems (1 item)
Build path specifies execution environment J2SE-1.5.  There are no JREs installed in the workplace that are strictly compatible with this environment.

I have the latest JDK (jdk1.6.0_25). From my understanding, I can do one of the following:

Download the J2SE-1.5 environment to match the project.
Edit the project to agree with the latest JDK. How can I do this?

Download the J2SE-1.5 environment due to prevent situation, when you will use new classes from newer jre, which in 1.5 was absent. This is a solution. — msangel, Feb 28 '13 at 22:26
four things are to be done, look http://stackoverflow.com/a/20692572/715269 — Gangnus, Dec 19 '13 at 22:05

score 53 · Answer 1 · answered Dec 10 '11 at 13:53

53

Right click on project, Properties, Java Build Path.
Remove the current JRE library.
Click Add library > JRE System Library > Workspace default JRE.

answered Dec 10 '11 at 13:53

Mahmoud Saleh

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much much easier for macosx users. thx – Snicolas Dec 27 '12 at 10:13
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Works properly on Windows too. – José Tomás Tocino Feb 05 '13 at 12:47
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And after updating the Maven project the JRE 1.5 is back again. WITH JRE 1.7. (in pom compiler is set to 1.7) – Gangnus Dec 19 '13 at 21:53

score 20 · Accepted Answer · edited Oct 12 '14 at 00:35

20

Here's a good discussion on this:

How to use JDK 1.6 in 1.5 compliance mode

Basically you should

Download and install the 1.5 JDK. (download link)
In Eclipse, Go to Window → Preferences → Java → Installed JREs.
Add the 1.5 JDK to the list.
Select 1.5 as Compiler Compliance Level.

edited Oct 12 '14 at 00:35

Community

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answered May 20 '11 at 21:05

aioobe

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score 14 · Answer 3 · answered May 19 '13 at 09:18

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Go for the second option, Edit the project to agree with the latest JDK

Right click "JRE System Library [J2SE 1.5] in your project"
Choose "Properties"
Select "Workspace default JRE (jdk1.6)

enter image description here

answered May 19 '13 at 09:18

Prashanth Sams

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Don't need to remove anything for this configuration. It is simple :) – Prashanth Sams May 19 '13 at 09:22
But doesn't work. ;-( – Gangnus Dec 19 '13 at 21:53

score 4 · Answer 4 · answered May 20 '11 at 21:07

From the Package Explorer in Eclipse, you can right click the project, choose Build Path, Configure Build Path to get the build path dialog. From there you can remove the JRE reference for the 1.5 JRE and 'Add Library' to add a reference to your installed JRE.

score 3 · Answer 5 · answered May 20 '11 at 21:06

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To configure your JRE in eclipse:

Window > Preferences > Java > Installed JREs...
Click Add
Find the directory of your JDK > Click OK

answered May 20 '11 at 21:06

Kyle

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score 1 · Answer 6 · answered Feb 20 '16 at 17:58

Try this too in addition to MahmoudS comments. Change the maven compiler source and target in your pom.xml to the java version which you are using. Say 1.7 for jdk7

<maven.compiler.source>1.7</maven.compiler.source>
<maven.compiler.target>1.7</maven.compiler.target>

java build path problems

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