I just downloaded Java Mission Control (JMC) for the first time and upon starting JMC, the following popup appears:
I am trying to go through the Q&A but I am either not sure how to implement the suggested solutions, or the solutions don't seem to work, which I detail below:
My attempted solutions
Referring to the suggested solutions enumerated above:
A1: I am not running in Eclipse (I am running the JMC app directly as an executable), and anyway what does it mean to "run an app on a JDK, not a JRE"?
A2: Indeed the hsperfdata folder was not writeable, so I modified the folder to give all permissions to everyone and closed all Java apps:
However, after starting a new Java app, the permissions revert back to their original settings and thus I am unable to implement this suggested solution:
A3: The line after -vm is not empty, so I don't think this suggested solution is relevant for me:
For what it's worth, both JConsole and JVisualVM are able to find all running Java processes:
In case it is helpful for others with the same issue, I was able to resolve the problem described above by adding the location of the JRE contained within the JDK to the front of the System PATH variable (Windows 10):
Related
I wonder if anyone can help me with Cytoscape start issue. It used to fucntiona perfectly but now it can no longer initiate. I reinstall the Cytoscape multiple times. When I ran the checker script (described on troubleshooting page) and "I receive Java is not reachable". See attached PICTURE 1 I reinstalled Java 11 but still has no luck. Here is my CytoscapeConfiguration folder looks like PICTURE 2. Thank you all in advance.
FYI
MacOS Mojave.
Cytoscape 3.9.0
Inside "JavaVirtualMachines" directory, there are:
adoptopenjdk-11.jdk
jdk-11.0.12.jdk
jdk-12.0.1.jdk
OK, so you have a number of java JDKs installed, but it's not clear which of these is active. The easiest way to determine that is to open up a terminal window and type "which java". That should give you a pointer to the actual java binary (it's /Library/Java/JavaVirtualMachines/adoptopenjdk-11.jdk/Contents/Home/bin/java on my Mac). If it doesn't come back with anything, then Java didn't get correctly installed. You might try explicitly setting your JAVA_HOME to the correct JDK (/Library/Java/JavaVirtualMachines/adoptopenjdk-11.jdk/Contents/Home) and seeing if that works.
-- scooter
This is a followup to this question.
MacOS X has the java command under /usr/bin. If one installs the JRE from Oracle, it doesn't work - claims there's no Java runtime, and offers to download and install Apple's runtime. But if you first run
export JAVA_HOME=/Library/Internet Plug-Ins/JavaAppletPlugin.plugin/Contents/Home
then java works as expected. That's where Oracle JRE installs itself.
Now I'd like to use the Oracle Java VM in-process, and I can't - the "You need Java runtime" error message keeps popping up, even with JAVA_HOME being set.
Linking against the JavaVM framework causes the message on app startup, even before main().
Trying to dynamically load /Library/Internet Plug-Ins/JavaAppletPlugin.plugin/Contents/Home/lib/server/libjvm.dylib and invoke JNI_CreateJavaVM causes the same message during the method call.
EDIT: the java command does it somehow, after all. I've poked around with a debugger, it does invoke JNI_CreateJavaVM at some point. I've even mimicked the arguments (there's one extra one, -Dsun.java.launcher=SUN_STANDARD), it didn't make any difference.
Found the answer here.
Instead of loading libjvm.dylib, one needs to load /Library/Internet Plug-Ins/JavaAppletPlugin.plugin/Contents/Home/lib/jli/libjli.dylib. It exports JNI_CreateJavaVM, too. Call that one, and it'll work as expected.
Works even with JAVA_HOME not being set.
Future warning: Oracle says that since Java 1.9, the browser plugin technology will no longer be supported. With that in mind, Oracle JRE's home in version 1.9 might not be under Internet Plug-Ins anymore.
I tried to download Java on my laptop (which has windows 10) but i keep getting a 1603 error. My computer used to have windows 8.1 and it did not work back then either
I appreciate any advice to solve or work around this problem
I have had this problem. I was able to fix it thanks to a co-worker. The problem started happening after I installed HP Unified Functional Testing (UFT, aka QTP). Installing this product changes the Windows environment variables used by Java. He told me the following: "So change the names of JAVA_OPTIONS, IBM_JAVA_OPTIONS, JAVA_TOOL_OPTIONS to something else (both in system and user variables) and delete any Java folder(in Program Files (x86) or Program Files) which gets installed despite the error. Restart the system and then try installing Java."
Actually, all I did was rename the environment variables and run the installer. This worked.
My answer is not related to win 10, but might help someone who is having similar problem in windows 7 machine and not able to install jre 32 bit version.
the work around to this is once you downloaded the jre, copy the path "C:\Program Files (x86)\Java\jre1.8.0_121\bin\javaw.exe" and paste it under java runtime environment settings which is found -Java Control panel>java>view
I think you downloaded the wrong version. If your laptop support x64 bit software you should download Java 1.8 x64 version.
Here is the link.
https://www.java.com/en/download/manual.jsp
I had this problem for a month now. I tried everything on my windows 8, but I couldn't get the latest java on it. When I tried to install java on an empty computer, the 64 bit version did not go through (error 1603) and I realized the problem didn't come from an old java install and I install 32 bit. it worked on the new computer with windows 7 and on my computer running 8.1.
note: I had deleted all the java versions before going through with it.
To fix java 1603 error you have to follow few simple steps.
First of all remove all old java version.
Then remove some windows update file which might be reason of this
error. Like KB2918614 update.
After that download and Install latest version of java and activate
java in browser. Now everything will be fine you can test the java
version on java website...
For explained and easy solution to java 1603 error follow this link: http://protechguides.com/java-error-code-1603-solved/
I encountered this error on Windows 8.1 and when I checked with Oracle web site, they said that is is not yet resolved, and under investigation. They also showed a link for off-line installation as an alternative arrangement. However, upon investigation of my system, i found out that the available space in C drive was only about 20 MB or so. I cleared my system and provided enough space. When I tried with the extra space, I didn't encounter any error. May be, you could try with a better free space...
First you should close the browser because if any webpage will use Java, it will cause conflict. Then do custom installation, i.e. install in some other folder other than default folder and point environment variable to newly installed Java location. It will resolve your issue.
I want to send a jar to some people for testing my software but I need that the jar is launched on a 32bit jvm. How can I verify automatically that the 32 bit jvm is installed and to be sure that the jar is launched with the right jvm?
I want to avoid to ask people to do all manually because they are not technical guys.
Can you help me?
******** SOLUTIONS ******
I have found two type of solutions that i want to share with you:
1) I have discovered that C:\Windows\SysWoW64 and C:\Windows\system32 contain the last installed version of the java.exe. So, ones could write a .bat that verifies which is the 32bit jvm for launching the code
2) Use the java code described in an other post for generating the proper .bat
As far as I know there is no simple way to achieve that. First guess is, of course, the %JAVA_HOME%. But it is most likely not set on the PC of "not technical guy", so let's skip it.
I believe there is a tricky way with Windows registry that could work.
If Java was installed with an installer (not just manual unpack) it will have some registry entries. On my PC I've found key HKEY_LOCAL_MACHINE\SOFTWARE\JavaSoft\Java Runtime Environment\1.8.0_25\JavaHome that points to my Java installation. There is also JDK keys nearby. There are multiple versions that can be installed on the same machine so it is better to collect all this keys (both jre and jdk in both HKLM and HKCU) and try to find one that points to the 32bit version. And if one has non-Oracle Java on his PC then registry keys will most likely have another path (if even exist).
When you found java installation there are many ways to check if it is 32 or 64 bit. Take a look at this SO question.
For some reason my firefox browser stopped detecting java and now I can't run anything with java on it because it says that it's not installed, so I went to add/remove programs and tried to uninstall java but it just won't get removed.
http://rcupload.com/images/IDSnu.png
So when I try to uninstall it (Java(TM) 7 Update 5) a little window appears with a progress bar, after it completes it disappears but Java is still there..
this is the window that appears:
http://rcupload.com/images/HLUwZ.png
Here's what I tried to do:
1) Use CCleaner to uninstall it:
- I choose the program, press uninstall and it disappears, but when I refresh the list it will still be there. I also tried using the "remove entry" button in CCleaner and i just get a message saying "cannot delete msi installer'.
2) I tried using JavaRA:
- I ran it as administrator, clicked "remove older versions", and I got the message that Java JDK 1.7 was uninstalled and all the files, but now I see that there is no folder for it at "C:\program files (x86)\Java\" (there was one inside before, called something like jre-7) and the icon in the installed programs appears like a white box instead of looking the like the java logo.
3) I tried downloading java and installing it:
- I run it, it downloads and it gets to a screen where it asks me if I want to install a toolbar, I click next and I get this message:
http://rcupload.com/images/xiCIu.png
I also tried changing the destination folder. same result.
--
Resumed: I need to get rid of Java(TM) 7 Update 5 but the uninstaller seems not to work and files are missing.
Any help will be appreciated!
Thanks.
I was having the same exact problem, and solved it using Microsoft Fix it tool, here:
http://support.microsoft.com/mats/program_install_and_uninstall
Finally, a Microsoft troubleshooter that actually works !
I haven't experienced this before my self. Here's my guess. One may say this is a 'harsh' way to remove and cause system in-stability. But I don't see any other way with the given details.
Please don't continue if you don't understand every step. This is almost what the un-installer does behind the scenes. You will have to do them manually.
First Un-install Firefox.
It doesn't detect the Java version installed for some reason where the Java installer does. you'll have to re-install it later when everything is fine.
Delete (i mean, backup) your JRE folder in 'Program Files'
Open regedit, and find the key for Java Runtime under HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Uninstall and delete (export it first, just in case) the key. (You'll have to go through each key and see the DisplayName for them.)
This will remove the entry in Add/Remove programs and Windows will think there's no Java.
Remove Java path from your System's Environment variables.
This will cause some apps that check for Java to decide that there's no Java installed.
Run the un installer again (if it's still visible in Add/Remove Programs).
If Windows still has the reference to the uninstaller, this will cause it to update it self and remove any references because there's no registry entry, and no program files.
Reboot the machine.
This will flush any waiting changes, unregister stuff .etc.
Try installing Java again. (Installer should not detect that there's Java installed, because there's no Environment variables set, and no registry entries.)
Please try this at your own risk. This may cause issues in your system.
You may get a better answer if posted on superuser site.
Let us know the results.