The printable version is no longer supported and may have rendering errors. Please update your browser bookmarks and please use the default browser print function instead.

OpenJDK package name on Fedora is java-1.?.0-openjdk.

Java Consoles

There are at least 2 consoles:

OpenJDK 8
- Monitoring ...
- Policy ...
IcedTea (deprecated ??)
- Monitoring
- Policy ...

shared library paths

OpenJDK's java.library.path, shared library paths for i386 are:

/usr/lib
/usr/lib/jvm/java-1.?.0-openjdk-1.?.0.0.x86_64/jre/lib/

and for x86_64:

/usr/lib64
/usr/lib/jvm/java-1.?.0-openjdk-1.?.0.0.x86_64/jre/lib/amd64/

Java subsystem debugging

Preparations

For all Java subsystem debugging, installing the symbols package java-1.8.0-openjdk-debuginfo is essential. All debuginfo sub-packages reside in own repository which needs to be enabled for installation at least. An example yum command:

# dnf install --enablerepo=fedora-debuginfo -y java-1.8.0-openjdk-debuginfo

Applets ??

Applets are deprecated, no ???

Console has moved to icedTea itself (requires icedtea-web package). Activating the console can be done with gui-tool:

 Program menu --> Settings --> IcedTea Web Control Panel

Console can for example list detailed information about the environment which can be useful for bug reporting:

System Properties:

http.agent: Java(tm) 2 SDK, Standard Edition v1.6.0_0
package.restrict.definition.java: true
java.version.applet: true
java.runtime.name: OpenJDK Runtime Environment
sun.boot.library.path: /usr/lib/jvm/java-1.6.0-openjdk-1.6.0.0.x86_64/jre/lib/amd64
java.vm.version: 14.0-b16
browser: sun.applet.AppletViewer
java.vendor.applet: true
java.vm.vendor: Sun Microsystems Inc.
java.vendor.url: http://java.sun.com/
path.separator: :
java.vm.name: OpenJDK 64-Bit Server VM
file.encoding.pkg: sun.io
file.separator.applet: true
user.country: US
sun.java.launcher: SUN_STANDARD
sun.os.patch.level: unknown
os.version.applet: true
java.vm.specification.name: Java Virtual Machine Specification
user.dir: /home/tuju/Documents
java.runtime.version: 1.6.0_0-b16
java.awt.graphicsenv: sun.awt.X11GraphicsEnvironment
java.endorsed.dirs: /usr/lib/jvm/java-1.6.0-openjdk-1.6.0.0.x86_64/jre/lib/endorsed
os.arch: amd64
browser.version: 1.06
javax.accessibility.assistive_technologies: org.GNOME.Accessibility.JavaBridge
line.separator: 

java.io.tmpdir: /tmp
java.vm.specification.vendor: Sun Microsystems Inc.
os.name: Linux
java.class.version.applet: true
sun.jnu.encoding: UTF-8
java.library.path: /usr/lib/jvm/java-1.6.0-openjdk-1.6.0.0.x86_64/jre/lib/amd64/server:/usr/lib/jvm/java-1.6.0-openjdk-1.6.0.0.x86_64/jre/lib/amd64:/usr/lib/jvm/java-1.6.0-openjdk-1.6.0.0.x86_64/jre/../lib/amd64:/usr/lib64/firefox-3.5.5:/usr/lib64/firefox-3.5.5/plugins:/usr/lib64/firefox-3.5.5:/usr/java/packages/lib/amd64:/usr/lib64:/lib64:/lib:/usr/lib
java.class.version: 50.0
java.specification.name: Java Platform API Specification
path.separator.applet: true
sun.management.compiler: HotSpot 64-Bit Server Compiler
package.restrict.definition.sun: true
os.arch.applet: true
os.version: 2.6.30.9-96.fc11.x86_64
browser.vendor: Sun Microsystems Inc.
user.home: /home/tuju
user.zoneinfo.dir: /usr/share/javazi
user.timezone: Europe/Tallinn
java.awt.printerjob: sun.print.PSPrinterJob
line.separator.applet: true
java.specification.version: 1.6
file.encoding: UTF-8
java.class.path: .
user.name: tuju
os.name.applet: true
java.vm.specification.version: 1.0
java.home: /usr/lib/jvm/java-1.6.0-openjdk-1.6.0.0.x86_64/jre
sun.arch.data.model: 64
user.language: en
java.specification.vendor: Sun Microsystems Inc.
java.vm.info: mixed mode
java.version: 1.6.0_0
java.ext.dirs: /usr/lib/jvm/java-1.6.0-openjdk-1.6.0.0.x86_64/jre/lib/ext:/usr/java/packages/lib/ext
sun.boot.class.path: /usr/lib/jvm/java-1.6.0-openjdk-1.6.0.0.x86_64/jre/lib/resources.jar:/usr/lib/jvm/java-1.6.0-openjdk-1.6.0.0.x86_64/jre/lib/rt.jar:/usr/lib/jvm/java-1.6.0-openjdk-1.6.0.0.x86_64/jre/lib/sunrsasign.jar:/usr/lib/jvm/java-1.6.0-openjdk-1.6.0.0.x86_64/jre/lib/jsse.jar:/usr/lib/jvm/java-1.6.0-openjdk-1.6.0.0.x86_64/jre/lib/jce.jar:/usr/lib/jvm/java-1.6.0-openjdk-1.6.0.0.x86_64/jre/lib/charsets.jar:/usr/lib/jvm/java-1.6.0-openjdk-1.6.0.0.x86_64/jre/lib/rhino.jar:/usr/lib/jvm/java-1.6.0-openjdk-1.6.0.0.x86_64/jre/classes
java.vendor: Sun Microsystems Inc.
file.separator: /
java.vendor.url.bug: http://java.sun.com/cgi-bin/bugreport.cgi
sun.io.unicode.encoding: UnicodeLittle
sun.cpu.endian: little
java.vendor.url.applet: true
sun.cpu.isalist:

Test URLs

Fedora's JRE in browser environment can be tested using the following test pages:

Note that those pages itself are sad examples of compliance of specifications: buggy or buggier - if you know any better pages, change them here.

References

Firefox Web Developer Add-on

Search

Java/Troubleshooting

Contents