Develop Reference

I can't reinstalling java: newer version of java found message pops up

Im quite a newbies, this is what happen. For the first time, i installed jdk 8 to run jaspersoft ETL. after doing some development, i want to test run the ETL build on a server but it seems that the server is using the java 6 so i can't run it. Even a simple java program like hello world can't be executed (if compile with IDE using jre8). i can't install java 6 on the server since they wont give me permission. so im using the java compliance level setting to rebuild the ETL. i installed jdk 6 into my computer and configure the compliance level but it seems that whatever i do, the program wont build. so i figured there is maybe a conflict between java 6 and java 8 on my computer.
(here is actually my problem)
So i uninstall all the java version i have using the traditional control panel method. then i reinstall jdk 6 but during installation a message pops up saying "newer version of java already found" (something like that). i check on my Program Files/Java folder under C:, only jdk folder exist but no jre. i try uninstall and install it again but still have the same issue. Why do it keep saying that theres already a newer version of java found when im already have uninstall everything.
I already remove the registry using this method: https://java.com/en/download/help/manual_regedit.xml
but still got the same issue

The version is still exist because your operating system using it.

Fixed it. i install the troubleshooting software from microsoft for this kind of issue. got it from here: https://support.microsoft.com/en-us/help/17588/fix-problems-that-block-programs-from-being-installed-or-removed

Unable to install Java on Windows 10 (1603 Error)

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.

Web starter application throws JNLPException after update of JRE, Java 7u65

Our customers have reported an issue that with high probability is caused by an JRE update, closer determined JRE 7 update 65 (JRE 7u65). I was able to recreate this, the exception message I get is very unhelpful, looks like:
JNLPException[category: Launch File Error : Exception: null : LaunchDesc:
In Java Console output I see this:
Java Web Start 10.65.2.20
Using JRE version 1.7.0_65-b20 Java HotSpot(TM) Client VM
#### Java Web Start Error:
#### Could not find main-class se.linkon.sabine.clients.sabineclient.invoker.NBRunWrapper in .....
Do you have any clue what is wrong? Can this be a bug in JRE 7u65?
I have tested the application with JRE 7u55 and with this configuration the application works smooth. I have tested on a Windows 7 machine.
Best Regards

I just ran into the exact same problem moving from 1.7.0_60 to 1.7.0_67.
The solution in my case was that the main="true" attribute in the jnlp file was on the wrong jar. I verified that this didn't matter under 1.7.0_60 or earlier.
However, nowhere in the _65 or _67 release notes does it mention this. I suspect it's related to work for the -Entry-Point manifest attribute that's mentioned in the 1.8 stream release notes, but only Oracle could answer that.

Without any more details it is difficult to tell. There had been problems in that area NullPointerException in invokeLater while running through Java Webstart however its just taking stabs in the dark...

Updating Heroku App to Java 8

I have a Play 2.2 app I'm using with Java 8 that I'm having trouble getting to work. The code compiles locally for me using OpenJDK 1.8, but when I try and push the code to Heroku, I get the following error, which was the error I was getting earlier locally when I was running on OpenJDK 1.7 with lambdas by accident.
java.lang.RuntimeException: Unknown constant: 18
I set system.properties to use Java 1.8 and I know that's working because it's starting up with the following text:
Play 2.x - Java app detected
-----> Installing OpenJDK 1.8...done
Is there something I'm forgetting to do to update to Java 8?
I tried updating the PATH as well as specified here but that didn't do anything.

Unknown constant: 18 most probably refers to CONSTANT_InvokeDynamic tag in the class file’s constant pool which has the value 18. This can’t be a JDK issue as even Java 7 understands that tag.
So it is an indicator for a byte code manipulation tool running in your runtime not understanding newer class files (but trying to process them despite the unknown version number). That worked with Java 7 as the invokedynamic feature exists but is not used with ordinary Java 7 class files (i.e. produced by javac).
Since you knew if you used bytecode manipulation by yourself, it must be part of a framework, i.e. you named heroku and the playframework. So you problem is not about updating the JDK but updating the frameworks to Java-8-aware versions, if such versions already exist.

As an add-on to Holger's response, here's what Heroku support had to say:
Hi,
Java 8 is still on an old pre-release due to delays on a linux distribution of OpenJDK. You can track the status of JDK 8 here:
https://github.com/heroku/heroku-buildpack-jvm-common/issues/10#issuecomment-38006175

compile error after upgrading to Java 7: package sun.security.pkcs11 does not exist

I just upgraded from Java 6 to Java 7 SDK and am now getting the following error in my ant build:
error: package sun.security.pkcs11 does not exist
Provider p = new sun.security.pkcs11.SunPKCS11(is);
I'm running Windows 7 64-bit. I can compile fine if I switch back to Java 6, but that is not an option any longer. I haven't had much luck finding a solution online. Anybody knows how to resolve this issue?

You will have to convert your application to use APIs which are not restricted. The compiler will warn you quite strictly when you have done such a thing -- this is the consequence of proceeding in the face of those warnings.
See Why Developers Should Not Write Programs That Call 'sun' Packages

I have faced the same problem and i solve it by installing the 32-bit JDK insteade of 64-bit and sure it will work .

The API has not been released by oracle oracle bug and the answers by tom and yassering are both corect.

Since sunPKCS11 support is not there in Windows 64 bit, i am assuming that you are using windows 64 bit just for build environment and your runtime might be a linux or other supported environments.
If the above is true, then inorder to make the build work, copy the sunpkcs11.jar from a 32 bit jdk and copy to a 64 bit jdk under jre\lib\ext. This worked for me.
Or, alternatively wait for jdk8 where its fixed.

I'm having the same error.
Only a type can be imported. sun.security.pkcs11.wrapper.CK_AES_CTR_PARAMS resolves to a package
I have windows 7 x64 with jdk 7x64 installed then replaced with jdk 7x32. I also made sure that my JAVA_HOME was set to the new jdk installation. I get the same problem when I run my application.