Java security settings linux

Ubuntu – How to configure Java security settings, etc

I have installed JDK 7, but how do I configure settings like security, etc?

On Windows, I can set up JDK 7 from Control Panel -> Java.

Best Answer

The name of the control panel is different depending on whether you are using the Oracle JDK or OpenJDK.

Search for «control panel» in the dash. If you’re using the Oracle JDK, you’ll see the Oracle Java 7 Plugin Control Panel. If you’re using OpenJDK, you’ll see the Iced Tea Web Control Panel.

Related Solutions

Ubuntu – How to Upgrade Oracle JDK and remove old JDK settings

Upgrade may cause problems , so its better to do a fresh install.

Completely remove Open-jdk

just use this simple commands in terminal to remove open jdk completely

sudo apt-get purge openjdk-\* 

How to install Oracle-Java

To get an automatically update-able Java from Oracle, you can you use the PPA provided from webup8.

sudo add-apt-repository ppa:webupd8team/java sudo apt-get update sudo apt-get install oracle-java7-installer 

Installing Oracle Java manually

For installing Latest Oracle Java:

To check ubuntu system architecture installed

Download the Oracle Java JDK for Linux. Make sure you select the correct compressed binaries for your system architecture 32-bit or 64-bit (which end in tar.gz).It will be downloaded in Downloads folder in home.So first open nautilus with sudo as

and make a folder java under

and then folow the following commands:

cd /home/"your_user_name"/Downloads sudo cp -r jdk-7u40-linux-x64.tar.gz /usr/local/java cd /usr/local/java sudo chmod a+x jdk-7u40-linux-x64.tar.gz sudo tar xvzf jdk-7u40-linux-x64.tar.gz 

At this point you should have two uncompressed binary directories in /usr/local/java check it by

Now edit the system path file by

scroll down to the last and add following lines

JAVA_HOME=/usr/local/java/jdk1.7.0_40 PATH=$PATH:$HOME/bin:$JAVA_HOME/bin export JAVA_HOME export PATH 

Save and exit and write these commands in terminal to Inform your Ubuntu Linux system where your Oracle Java JDK/JRE is located.

sudo update-alternatives --install "/usr/bin/java" "java" "/usr/local/java/jdk1.7.0_40/bin/java" 1 sudo update-alternatives --install "/usr/bin/javac" "javac" "/usr/local/java/jdk1.7.0_40/bin/javac" 1 sudo update-alternatives --install "/usr/bin/javaws" "javaws" "/usr/local/java/jdk1.7.0_40/bin/javaws" 1 sudo update-alternatives --set java /usr/local/java/jdk1.7.0_40/bin/java sudo update-alternatives --set javac /usr/local/java/jdk1.7.0_40/bin/javac sudo update-alternatives --set javaws /usr/local/java/jdk1.7.0_40/bin/javaws . /etc/profile 

Now everything is installed just check it by

java version "1.7.0_40" Java(TM) SE Runtime Environment (build 1.7.0_40-b40) Java HotSpot(TM) Server VM (build 23.1-b03, mixed mode) 

Congratulation now its installed.

Ubuntu – JAVA blocked due to security level on Ubuntu 13.10

I find these «it works on my machine» and «use what I use» answers annoying. If you’re using Oracle’s JDK and having this problem on Linux, add the following line to your ~/.java/deployment/deployment.properties file:

deployment.security.level=MEDIUM 

Then restart your browser. This is the Linux equivalent of all the Windows and Mac OS X specific «set your security level to Medium» instructions polluting the «how do I do this on Linux» search results.

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Introduction

With the latest Java updates the security settings has been set at a higher level by default and there are many websites that now experience problems with some older Java applets that no longer works. This is a common informational dialog box that is shown lately.

If Java is a requirement for your Linux/Windows workstation, perhaps if you are using the console feature in SolusVM, consider adjusting the java security level for best security/functionality.

Let me show you how it is done!

Resolution

In Linux: From the terminal, run the command jcontrol (should mention that you need a desktop GUI for this)

In Windows: Double-click the Java icon in the control panel.

This will launch the Java Control Panel. In this Control Panel various security settings can be made as well as an option to disable java completely in the browser. This Control Panel looks the same in Windows and Linux.

Go to the Security tab and click on the Edit Site List button, in the next dialog, enter the base url to the site that you want to add as an exception to the security level and click OK.

Click OK until all dialog boxes are closed. Restart your browser and reload the website that you were blocked from before.

If you have completed all steps the java applet will work without problems.

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How do I configure Java security settings, etc?

I have installed JDK 7, but how do I configure settings like security, etc? On Windows, I can set up JDK 7 from Control Panel -> Java.

Maybe it have some configuration files, you can find them by dpkg -L openjdk-7-jre . This command list all files installed by that package.

5 Answers 5

The name of the control panel is different depending on whether you are using the Oracle JDK or OpenJDK.

Search for «control panel» in the dash. If you’re using the Oracle JDK, you’ll see the Oracle Java 7 Plugin Control Panel. If you’re using OpenJDK, you’ll see the Iced Tea Web Control Panel.

If you use Oracle Java you can run the control panel from jcontrol under the installation path, if you prefer to use a terminal

To configure certificates in Java control panel for OpenJDK or IcedTea-Web use the command:

Search for «java» in dash and it will show java control panel. Images from what it shows when started:

No,I couldn’t find out this in dash command, what Java Packages I had installed are:- icedtea-7-jre-jamvm:amd64, openjdk-7-jdk:amd64, openjdk-7-jre:amd64, openjdk-7-jre-headless:amd64

On Ubuntu/mate, you have to configure the IcedTea Web control panel.

System -> Preferences -> IcedTea Web control panel 

then you can adjust the security level as shown in the picture below:

Just in case others are using webupd8.org to install the Oracle JDKs, Dash didn’t show the Java Control Panel (just the iced tea version).

I ended up having to run the Java Control Panel directly from the command line via /usr/bin/ControlPanel — their install scripts use update-alternatives to point there.

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Knowledgebase

As some of you may have noticed, the latest Java Security settings have been increased to a high level by default, this is an issue as there are many sites out there with older Java applets that will not work with this setting set to high, the following info box is shown:

So if you really need to use Java in either Windows or Linux, I’m going to show you how to get around this.

If you’re using Linux, from the terminal run the command jcontrol:

In Windows double click on the Java icon in the control panel:

After doing this you should see the Java Control Panel launching. In this control panel you can modify several security settings, this window should look the same in Linux and Windows.

Go to the security tab and click on the Edit Site List button, in the next dialog, enter the URL to the site you want to add as an expection to the security level and click OK.

Click OK until all dialog boxes are closed, restart your Internet Browser and try to load the site that was blocked before.

Keep in mind that it is not recommended to lower the global level, instead we want to use the Exception Site List.

Related Articles

Leaving the default settings of SSH is not a good idea, here are a few steps you should consider.

Securing your wordpress installation: We all know how easy it is to setup.

If you care about the security of your server (and you really should) one of the tools you can.

Источник

Knowledgebase

As some of you may have noticed, the latest Java Security settings have been increased to a high level by default, this is an issue as there are many sites out there with older Java applets that will not work with this setting set to high, the following info box is shown:

So if you really need to use Java in either Windows or Linux, I’m going to show you how to get around this.

If you’re using Linux, from the terminal run the command jcontrol:

In Windows double click on the Java icon in the control panel:

After doing this you should see the Java Control Panel launching. In this control panel you can modify several security settings, this window should look the same in Linux and Windows.

Go to the security tab and click on the Edit Site List button, in the next dialog, enter the URL to the site you want to add as an expection to the security level and click OK.

Click OK until all dialog boxes are closed, restart your Internet Browser and try to load the site that was blocked before.

Keep in mind that it is not recommended to lower the global level, instead we want to use the Exception Site List.

Related Articles

Leaving the default settings of SSH is not a good idea, here are a few steps you should consider.

Securing your wordpress installation: We all know how easy it is to setup.

If you care about the security of your server (and you really should) one of the tools you can.

Источник