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1. Run a java jar file in linux class how to#
2. Run a java jar file in linux class install#
3. Run a java jar file in linux class archive#

The manifest appears at the canonical location META-INF/MANIFEST.MF. The manifest directory has to be the first entry of the compressed archive. If a JAR file is intended to be used as an executable file, the manifest file specifies the main class of the application. It contains name-value pairs organized in sections. It defines extension and package-related data.

Run a java jar file in linux class install#

For instance, Microsoft Windows users who prefer having Windows EXE files can use tools such as JSmooth, Launch4J, WinRun4J or Nullsoft Scriptable Install System to wrap single JAR files into executables.Ī manifest file is a metadata file contained within a JAR. Native launchers can be created on most platforms. The typical invocation is java -jar foo.jar from a command line. Some operating systems can run these directly when clicked. Executable JAR files have the manifest specifying the entry point class with Main-Class: myPrograms.M圜lass and an explicit Class-Path (and the -cp argument is ignored). The content of JAR files may be obfuscated to make reverse engineering more difficult.Īn executable Java program can be packaged in a JAR file, along with any libraries the program uses. This prevents malicious code from being inserted into an existing package, and so gaining access to package-scoped classes and data. It can also support 'sealed' packages, in which the Classloader will only permit Java classes to be loaded into the same package if they are all signed by the same entities. When the Java runtime loads signed JAR files, it can validate the signatures and refuse to load classes that do not match the signature. Multiple entities may sign the JAR file, changing the JAR file itself with each signing, although the signed files themselves remain valid.

Run a java jar file in linux class archive#

The JAR itself is not signed, but instead every file inside the archive is listed along with its checksum it is these checksums that are signed. In that case, the signature information becomes part of the embedded manifest file. The contents of a file may be extracted using any standard compression software, or the jar command line utility: " -xf foo.".ĭevelopers can digitally sign JAR files. For instance, a Classpath entry can be used to specify other JAR files to load with the JAR.

Run a java jar file in linux class how to#

The entries in the manifest file describe how to use the JAR file. JAR file elements may be compressed, shortening download times.Ī JAR file may contain a manifest file, that is located at META-INF/MANIFEST.MF. A JAR file allows Java runtimes to efficiently deploy an entire application, including its classes and their associated resources, in a single request.