Lets say I'm writing Java code in Eclipse and then save it as a runnable .jar file. The code is 100% self-written, so no imports from other sources.
Does anything in the .jar file (file headers, ..) hold private data about my PC or my Eclipse version?
yep, potentially there is an auto-generate manifest file (jar:META-INF/MANIFEST.MF)
Here is default output of plugin
Manifest-Version: 1.0
Built-By: borisov andrey
Build-Jdk: 1.7.0_05
Created-By: Apache Maven
Archiver-Version: Plexus Archiver
As you can see at least username added to the manifest file
UPDATE: if you are using maven, you may want to configure maven jar plugin
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-jar-plugin</artifactId>
<version>${maven-jar-plugin-version}</version>
<inherited>true</inherited>
<executions>
<execution>
<goals>
<goal>test-jar</goal>
</goals>
</execution>
</executions>
<configuration>
<archive>
<manifestEntries>
<Created-By>${java.version} (${java.vendor})</Created-By>
<Built-By>ME</Built-By>
<Implementation-Title>${project.name}</Implementation-Title>
<Implementation-URL>SOME URL if you want</Implementation-URL>
<Implementation-Version>${project.version}</Implementation-Version>
<Implementation-Vendor>your company</Implementation-Vendor>
<Implementation-Vendor-Id>your vendore id</Implementation-Vendor-Id>
</manifestEntries>
</archive>
</configuration>
</plugin>
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