See Setting the Class Path. In effect, the three search paths together form a simple class path. This is similar to the flat class path previously used, but the current model has the following improvements:. In general, you only have to specify the location of user classes. Bootstrap classes and extension classes are found automatically.
The tools classes are now in a separate archive tools. Bootstrap classes are the classes that implement Java SE. Bootstrap classes are in the rt. These archives are specified by the value of the bootstrap class path that is stored in the sun. This system property is for reference only and should not be directly modified.
It is unlikely that you will need to redefine the bootstrap class path. The nonstandard option, -Xbootclasspath , allows you to do so in those rare circumstances in which it is necessary to use a different set of core classes. Note that the classes that implement the JDK tools are in a separate archive from the bootstrap classes.
The development tools add this archive to the user class path when invoking the launcher. However, this augmented user class path is only used to execute the tool. The tools that process source code, the javac command, and the javadoc command, use the original class path, not the augmented version.
For more information, see How the javac and javadoc Commands Find Classes. Extension classes are classes that extend the Java platform. Loose class files in the extension directory are not found. They must be contained in a JAR file or Zip file. There is no option provided for changing the location of the extension directory.
To find user classes, the launcher refers to the user class path, which is a list of directories, JAR files, and Zip files that contain class files. A class file has a subpath name that reflects the fully-qualified name of the class. For example, if the class com. If the class is stored in an archive named myclasses. The user class path is specified as a string, with a colon : to separate the class path entries.
The Java launcher puts the user class path string in the java. Kulfy Kulfy Sign up or log in Sign up using Google. Sign up using Facebook. Sign up using Email and Password. Post as a guest Name. Email Required, but never shown. The Overflow Blog.
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Now live: A fully responsive profile. Related 2. Unable to locate tools. Asked 10 years, 6 months ago. Active 4 months ago. Viewed k times. I am building a project in Java. I have this error: Unable to locate tools. Improve this question. As an aside, what I find astonishing is that the program actually said where it looked.
So few programs provide this useful clue. Also see the duplicate question: stackoverflow. Add a comment. Active Oldest Votes. Improve this answer. How can this be your answer? You have already mentioned that you have installed jdk and jre. I'm actually facing a similar problem and it still continues Need to know how you got it working?? You realize that this answer is two years old, right?
In ubuntu: apt-get install default-jdk and the error disappears. The key? That's what has the tools. JRE does not. Not necessarily. Show 4 more comments.
Blake Mitchell Blake Mitchell 2, 1 1 gold badge 23 23 silver badges 22 22 bronze badges. Thanks, I wish I could give you 2 ups! James Lawruk James Lawruk Thanks, I was loooking for this for hours!! Work like charm on Windows8. Ankur 5, 19 19 gold badges 35 35 silver badges 62 62 bronze badges. Kamlesh Pant Kamlesh Pant 3 3 silver badges 3 3 bronze badges. Polluting local installations with classes which clearly don't belong there can lead to the Works on my machine syndrome.
That is even if a formal build process is in place. Thanks for this workaround! In my case I copied corretto Graham Chiu Graham Chiu 4, 1 1 gold badge 20 20 silver badges 37 37 bronze badges. This answer is more relevant today than the earlier upvoted answers — deepak. Zorayr Zorayr If you are in Linux you can solve this by installing java on the system: sudo apt-get install openjdkjdk openjdkjre. Obviously, you can use 'sudo apt-get install openjdkjdk openjdkjre' for Java 8 — schlenger.
Sean Patrick Floyd Sean Patrick Floyd k 60 60 gold badges silver badges bronze badges. I just checked!
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