When compiling v Java, you may gain a warning message similar (or similar to):

warning: bootstrap class path not collection in conjunction through -source 1.5This warning is emitted if you space using JDK 7 construct 121 or later on (earlier execution of the compiler would not worry 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 variation of Java you are compiling for room different. Because that example, girlfriend may have version 7 that the compiler installed, yet are choosing to compile for Java variation 5.0. When the compiler is capable of emitting code for various versions, it demands to use the correct startup libraries (bootstrap) in order to insurance it will role correctly.

In any kind of other language, this would certainly be called “linking versus the correct startup libraries”, but in Java, it is dubbed “compiling against bootstrap and also extension classes”.

For individuals of NetBeans IDE

These instructions space for NetBeans concept 7.3.

I doubt the instructions are the exact same for various other versions that NetBeans IDE, but I make no guarantee.

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

1) Right-click ~ above the project:


2) Select Properties:


3) Ensure the the Source/Binary Format: under the resources category, matches the Java platform under the Libraries group (click for complete sized image):


For Command heat Users

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

For example, if you have JDK 7 installed and want come compile because that Java 5.0, climate the command line would certainly 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 course to the rt.jar file of Java 5.0 (note: you have to include rt.jar as component of the path.

Where code.java is Java password compatible through version 5.0.

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

Java 1.2 => 1.3 (unless over there is a typo in the JDK 7 warning, it is 1.3 no 1.2)Java 1.3 => 1.3Java 1.4 => 1.4Java 5.0 => 1.5Java 6 => 1.6

Normally, you execute not have to specify the -target option since by default it is set the exact same as the -source option.

For Other ide Users

You will need to read (or explore) your ide to recognize where the compiler and also target settings are located. It is more than likely a for sure bet the they are component of the project alternatives (try right-clicking ~ above the job name and also see if a food selection pops up, or view if over there is something like a task Options setup somewhere.

More Information

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

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

javac – Java programming language compiler – search for bootclasspath ~ above the page

Java SE 7 and also JDK 7 Compatibility – a discussion around Java 7 compatibility through previous versions

Published April 3, 2013

Do not republish this article, in entirety or in part. You might publish a quick excerpt and provide a link earlier to the original article.

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