Java Error Your security settings have blocked a local application from running

Question

I m trying to run this simple HelloWorld code written in Java from my browser  Chrome    public class HelloWorld extends JApplet   public void init         try           SwingUtilities invokeAndWait new Runnable                 public void run                     JLabel lbl   new JLabel  Hello World                    add lbl                                       catch  Exception e            System err println  createGUI didn t complete successfully              I compiled it with NetBeans  and then I created a WebApplication project  The HTML code that runs the applet is    lt html gt       lt head gt           lt title gt  lt  title gt           lt meta http-equiv  Content-Type  content  text html  charset UTF-8  gt       lt  head gt       lt body gt           lt p gt  lt applet code  HelloWorld  archive  applet HelloWorld jar   width  590  height  530  gt  lt  applet gt  lt  p gt       lt  body gt   lt  html gt    If run the applet from NetBeans it works  But when I run the HTML code by double clicking it  the following message pops up from the browser      Your security settings have blocked a local application from running     I tried with Internet nbsp Explorer and Firefox but nothing   This message started to appear after the last update of Java  Where is the problem

User · Answer

I faced the same issue today  and I was able to fix the issue by changing the security settings on the Java Control Panel from HIGH to MEDIUM   Well  setting the Java Security Setting to MEDIUM permanently is not really recommended as this will allow potentialy malicious software to run on your system and not be blocked  So I suggest after running your applet you may want to change back the setting to HIGH   Location of the Java Control Panel  Change the setting of the Control Panel

User · Answer

I am using an older Data Structure and Algs book that comes with Java Applets for practice  So I needed to store and run some applets locally  I am currently running Windows 10 OS with Edge  Chrome  and IE 11     Running applets seem to only be allowed in IE11  and as other have mentioned you have to add the applet to the exception list  My issue was since I am storing these locally  and opening them in IE  it opened with path starting with  C        Adding the full path using   file        like mentioned in one of the other answers didn t work for me    The fix  So  I just added without the quotes    file      to the exception site list and finally got it working  This also allows me to run any applet stored locally  and I do not have to explicitly add an exception for each applet path   I plan to remove the exception from the list once I am done using the programs  and only add it back as necessary

User · Answer

My problem case was to run portecle jnlp file locally using Java8   What worked for me was   Start Programs --  Java --  Configure Java    Go to Security --  Edit Site List    Add http   portecle sourceforce net Start javaws portecle jnlp in CMD prompt   On step 3  you might try also to add file    c  path portecle jnlp  but this addition didn t help with my case

User · Answer

If you are using Linux  these settings are available using  usr bin jcontrol  or your path setting to get the current Java tools   You can also edit the files in    java deployment deployment properties to set  deployment security level MEDIUM    Surprisingly  this information is not readily available from the Oracle web site  I miss java sun com

User · Answer

If you have no Medium security level  then you should add your application to the Exception Site List  Java Control Panel   Security tab     Open your applet in a browser and copy the contents of your address bar   Go to Control Panel   Java Control Panel   Security tab and press the Edit Site List    button   Press the Add button  insert your path and press Enter   Press Continue on the security warning that appears    Open the applet again and don t forget to press Run on the pop-up window

User · Answer

After reading Java 7 Update 21 Security Improvements in Detail  mention    With the introduced changes it is most likely that no end-user is able to run your application when they are either self-signed or unsigned     I was wondering how this would go for loose class files - the  simplest  applets of all  Local file system   Your security settings have blocked a local application from running  That is the dialog seen for an applet consisting of loose class files being loaded off the local file system when the JRE is set to the default  High  security setting   Note that a slight quirk of the JRE only produced that on point 3 of   Load the applet page to see a broken applet symbol that leads to an empty console  Open the Java settings and set the level to Medium  Close browser  amp  Java settings  Load the applet page to see the applet  Open the Java settings and set the level to High  Close browser  amp  Java settings  Load the applet page to see a broken applet symbol  amp  the above dialog   Internet If you load the simple applet  loose class file  seen at this resizable applet demo off the internet - which boasts an applet element of   lt applet     code  quot PlafChanger class quot      codebase  quot   quot      alt  quot Pluggable Look n Feel Changer appears here if Java is enabled quot      width  100       height  250  gt   lt p gt Pluggable Look n Feel Changer appears here in a Java capable browser  lt  p gt   lt  applet gt   It also seems to load successfully   Implying that - Applets loaded from the local file system are now subject to a stricter security sandbox than those loaded from the internet or a local server  Security settings descriptions As of Java 7 update 51   Very High  Most secure setting - Only Java applications identified by a non-expired certificate from a trusted authority will be allowed to run  High  minimum recommended   Java applications identified by a certificate from a trusted authority will be allowed to run  Medium - All Java applications will be allowed to run after presenting a security prompt

User · Answer

Java applets do create a security risk  hence are disabled in most modern browsers  You have to lower the security to run it  There is a guide by Oracle for that

User · Answer

Go to Control Panel Double click on Java Open the Security tab Select Medium Click on Apply Restart your web browser    That s it

User · Answer

If you are like me whose Java Control Panel does not show Security slider under Security Tab to change security level from High to Medium then follow these instructions  Java known bug  security slider not visible     Symptoms      After installation  the checkbox to enable disable Java and the security level slider do not appear in the Java Control Panel Security tab  This can occur with 7u10 and above      Cause     This is due to a conflict that Java 7u10 and above have with standalone installations of JavaFX     Example  If Java 7u5 and JavaFX 2 1 1 are installed and if Java is updated to 7u11  the Java Control Panel does not show the checkbox or security slider    Resolution     It is recommended to uninstall all versions of Java and JavaFX before installing Java 7u10 and above    Please follow the steps below for resolving this issue     1  Remove all versions of Java and JavaFX through the Windows Uninstall Control Panel  Instructions on uninstalling Java     2  Run the Microsoft uninstall utility to repair corrupted registry keys that prevents programs from being completely uninstalled or blocking new installations and updates     3  Download and install the Windows offline installer package

User · Answer

Starting with Java 8  there is no  medium  risk setting in the Security tab under Java You will keep getting this error till you revert to older Java  suggested Java 7  it has hit the end of life though   Install both 32-bit and 64-bit version because browsers are still 32-bit  even on a 64-bit machine  64-bit OS

[java] Java Error: "Your security settings have blocked a local application from running"

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