Develop Reference

Unity - no java runtime present requesting install

I used Unity Hub to install Android build tools. I can locate these files on my computer. I set JAVA_HOME and "java -version" command works fine. When I try to build I get following error: No Java runtime present, requesting install. what can I do?
Unity Version: 2019.4.9f1.
Mac OS Catalina
Errors

I downloaded and installed JDK manually and finally it worked

Sencha Cmd 5 + Java 8 Error

After installing Java 8 JDK on my Windows build server, I'm running into the following error when executing the sencha command:
C:\> sencha
Error: Registry key 'Software\JavaSoft\Java Runtime Environment'\CurrentVersion'
has value '1.8', but '1.7' is required.
Error: could not find java.dll
Error: Could not find Java SE Runtime Environment.
The Sencha Cmd Guide implies that Java 8 isn't supported yet (however Sencha Cmd works fine on my Mac OS X workstation with Java 8):
Sencha Cmd requires Java Runtime Environment version 1.7 to support
all functionality...
I've still got JDK 7 installed on the server. Is there any way to force Sencha Cmd to use a different JDK install? Changing JAVA_HOME and PATH sysenvs does not work, and editing the registry isn't an option.
UPDATE: I've run across this question where multiple java.exe files cause the same error (and that's definitely a possibility here) however maven, ant, tomcat, jenkins, and a slew of other Java tools are working fine. I've only seen this error with Sencha Cmd.

To make this slightly more concrete, I followed ben's advice and created the following sencha.bat file in my installation directory:
#echo off
set JAVA_HOME=C:\Program Files\Java\jdk1.7.0_75
set PATH=%JAVA_HOME%\bin;%PATH%
set SENCHA_HOME=%~dp0
java -jar "%SENCHA_HOME%\sencha.jar" %*
and I renamed the existing sencha.exe to something innocuous. Now I can simply type "sencha" at the command line without extra fuss. Of course, if you have a different minor version of Java 7, you'll need to edit the JAVA_HOME above.

My 'Path' environment variable are mapping 'C:\ProgramData\Oracle\Java\javapath' which contains 3 shortcuts for following files from 'C:\Program Files\Java\jre1.8.0_xx\bin':
java.exe
javaw.exe
javaws.exe
But these files are also present in 'C:\Windows\System32'; if you call 'java' from this directory you will have the same error (Error: Registry key...)
By replacing these 3 files in 'C:\Windows\System32' by the one's from 'C:\Program Files\Java\jre1.8.0_xx\bin'; it will solve the issue.

Try the following workaround to use the latest SenchaCMD working with JDK8:
check your PATH environment variable; especially the correct java installation path(s)
open the command prompt and go to the sencha-cmd folder
to use SenchaCMD just execute the "sencha.jar"-file with java:
java -jar sencha.jar
Now, you should see all version informations about the executed SenchaCMD-Tool.
Tested with JDK 1.8.0u25 and SenchaCMD 5.1.0.26 on W7 Prof. x64

I had this exact same thing, found that I was required to update the sencha cmd itself. I had extjs 5.1 cmd 5.1.0 , downloaded extjs 6.0.1 and tried to sencha app upgrade {new_extjs6_path} my app. Received the above error, figured out I was required to update cmd to 6.0.1 as well.

Failed to run JAVA even though path is set on Windows 8 Enterprise - Cordova

I have made a new Ionic / Cordova project and I'm trying to build it on windows 8.1. I installed JDK and JRE 7 as well as android sdk and ant and added them to my path using the following instructions.
cordova platform add android not working while listing Android targets
When I execute ionic platform add android or cordova I am still getting the following error:
C:\Users\BogdanR\.cordova\lib\android\cordova\3.4.0\bin\node_modules\q\q.js:126
throw e;
^
Error: Failed to run 'java -version', make sure your java environment is set up
including JDK and JRE.
Your JAVA_HOME variable is C:\Program Files\Java\jdk1.7.0_51
Error: Command failed: 'java' is not recognized as an internal or external command,
operable program or batch file.
at C:\Users\BogdanR\.cordova\lib\android\cordova\3.4.0\bin\lib\check_reqs.js:62:22
at ChildProcess.exithandler (child_process.js:641:7)
at ChildProcess.EventEmitter.emit (events.js:98:17)
at maybeClose (child_process.js:743:16)
at Socket.<anonymous> (child_process.js:956:11)
at Socket.EventEmitter.emit (events.js:95:17)
at Pipe.close (net.js:466:12)
Error: cmd: Command failed with exit code 8
at ChildProcess.whenDone (C:\nodist\bin\node_modules\cordova\src\superspawn.js:112:23)
at ChildProcess.EventEmitter.emit (events.js:98:17)
at maybeClose (child_process.js:743:16)
at Process.ChildProcess._handle.onexit (child_process.js:810:5)
Unable to add platform android. Please see console for more info.
I tried modifying both system variables and user PATH variables.
THE WEIRD THING is that I can type in java -version and it works:
java version "1.7.0_51"
Java(TM) SE Runtime Environment (build 1.7.0_51-b13)
Java HotSpot(TM) 64-Bit Server VM (build 24.51-b03, mixed mode)
I am using nodist to manage npm if that is of any relevance.

After I ran into the same issue, the following steps seems to have fixed it:
PATH needs to contain the bin folder of the Java installation path C:\Program Files\Java\jdk1.8.0_05\bin make sure the bin is included
JAVA_HOME needs to be set to the root of that Java installation folder, in my case C:\Program Files\Java\jdk1.8.0_05

In my case, i had multiple java instalations, and whenever i tried to print "echo %java_home%" command on command prompt, it always used to return "%java_home%" as it is.
So i uninstalled all the java versions and then installed it again, and whoola, it worked.
Hope this helps someone.

There is one thing you can try is to set this variable JAVA_HOME to C:\Program Files\Java\jdk1.7.0_51\bin
Since you are using Windows, you can go to Control Panel to update it.
You were able to run java -version probably because it's included in the User's path.

In my case, It said "JAVA_HOME variable is unvalid, C:\Program Files\Java\jdk1.7.0_51".
Then I added a quotation mark to JAVA_HOME. Just like "C:\Program Files\Java\jdk1.7.0_51". Finally It works. May This can be helpful

There was a bad entry in the path that corrupted my whole system path.
C:\Program Files\Microsoft SQL Server\110\Tools\Binn";C:\Program Files\Microsoft\Web Platform Installer\;
Seems like that quotation mark is an entry added by SQL Server installation or web platform. I never added those to the path so it might be the installers fault?

Titanium SDK error

I have java 1.6 installed on my windows 8,i have configured the path and environment variables. And they work perfectly well coz i have eclipse installed on my system too. But titanium doesnt launch my project. I get the following error on build. Please i really need help with this.
[ERROR] Application Installer abnormal process termination.
Process exit value was 1 Titanium Command-Line Interface, CLI version 3.1.2,
Titanium SDK version 3.1.3.GA Copyright (c) 2012-2013, Appcelerator, Inc.
All Rights Reserved. [ERROR] : "Missing Java SDK. Please make sure Java SDK is on your PATH

have you checked this post? If you're having a 64 bit system install 32 bit java and set environment variable according to the new path. Since Titanium works only with 32 bit java version

fail in "mvn clean install"?

I am new in learning java programming! I want to make a .jar in a maven project. After running this command mvn clean install, I am getting the following error message:
Failed to execute goal org.apache.maven.plugins:maven-compiler-plugin:2.3.2:compile(default-compile) on project wps-demo: Compilation failure
Unable to locate the Javac Compiler in:C:\Program Files\Java\jre7..\lib\tools.jar
Please ensure you are using JDK 1.4 or above and not a JRE(the com.sun.tools.javac.Main class is required)
In most cases you can change the location of your Java
installation by setting the JAVA_HOME environment variable
what can I do for clean this error!

It looks like you have only a JRE (Java Runtime Environment) installed, and not a JDK (Java Development Kit), as this error message says:
Please ensure you are using JDK 1.4 or above and not a JRE(the com.sun.tools.javac.Main class is required)
Download and install the JDK (not JRE) from Oracle's website.
The JRE allows you to run Java programs, but does not include the tools that you need to develop Java software, such as the Java compiler. The JDK does include those tools.
If you already have a JDK installed, then make sure that the JAVA_HOME environment variable refers to the directory where you have the JDK installed, and not to a directory with a JRE.

As your error says you have wrong value in JAVA_HOME variable in system settings... should be something like C:\Program Files\Java\jre6
You can find how to set it HERE for example.

You need to set the environment variable that specifies the location of your java development kit so that windows can find the Java libraries
Put java home path in a JAVA_HOME variable that you can create in the advanced tab of MyComputer properties.
The Java home path would look something like this
C:\Program Files\Java\jdk1.5
Hope this helps

You may also want to have a look at the following article from Maven http://maven.apache.org/guides/mini/guide-building-jdk14-on-jdk15.html
It states that from Maven 2.2.0, Java JDK 1.5 is needed to allow Maven to build the Java project. The article also goes on to show how some of these adjustments can be made so that JDK 1.5 or later can be used in the build process.