When compiling with Java, girlfriend may obtain a warning message similar (or the same to):

warning: bootstrap course path not set in conjunction v -source 1.5This warning is emitted if you space using JDK 7 construct 121 or later (earlier version of the compiler would not issue a warning).

You are watching: Bootstrap class path not set in conjunction with 1.7

It is warning you that your Java compiler version and the version of Java you room compiling for space different. Because that example, you may have version 7 the the compiler installed, but are picking to compile for Java variation 5.0. While the compiler is capable of emitting code for various versions, it needs to use the exactly startup libraries (bootstrap) in stimulate to guarantee it will function correctly.

In any other language, this would be called “linking versus the exactly startup libraries”, yet in Java, it is dubbed “compiling against bootstrap and extension classes”.

For users of NetBeans IDE

These instructions are for NetBeans concept 7.3.

I suspect the instructions space the very same for various other versions the NetBeans IDE, however I do no guarantee.

You have the right to correct the warning by ensuring the compiler version and binary version room the same:

1) Right-click top top the project:


2) Select Properties:


3) Ensure that the Source/Binary Format: under the sources category, matches the Java communication under the Libraries classification (click for complete sized image):


For Command heat Users

If you room compiling making use of the command line, then you should ensure the the -source and also -target options refer to the same version and also the -bootclasspath alternative refers come the exactly Java runtime.

For example, if you have actually JDK 7 installed and also want to compile for Java 5.0, then the command line would be:

javac -source 1.5 -target 1.5 -bootclasspath path-to-java-5.0-runtime code.javaWhere path-to-java-5.0-runtime is the path to the rt.jar paper of Java 5.0 (note: you have actually to encompass rt.jar as part of the path.

Where code.java is Java code compatible v version 5.0.

Note: The mapping native Java variation to command line characteristics are:

Java 1.2 => 1.3 (unless there is a typo in the JDK 7 warning, the is 1.3 not 1.2)Java 1.3 => 1.3Java 1.4 => 1.4Java 5.0 => 1.5Java 6 => 1.6

Normally, you execute not need to specify the -target option due to the fact that by default the is set the same as the -source option.

For Other principle Users

You will have to read (or explore) your principle to determine where the compiler and target settings are located. That is probably a for sure bet that they are component of the project alternatives (try right-clicking ~ above the project name and see if a food selection pops up, or check out if there is something prefer a job Options setup somewhere.

More Information

These are external links and also where considered to it is in safe and relevant at the moment of publication.

If over there are problems with them, you re welcome let me know.

javac – Java programming language compiler – search for bootclasspath top top the page

Java SE 7 and JDK 7 Compatibility – a discussion about Java 7 compatibility v previous versions

Published April 3, 2013

Do no republish this article, in entirety or in part. You might publish a quick excerpt and provide a link ago to the initial article.

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