Update Java Environment Variable Windows 10
Halima Wallace
You'll need to close and re-open any command windows that were open before you made these changes, as there's no way to reload environment variables from an active command prompt. If the changes don't take effect after reopening the command window, restart Windows.
I'm trying to get Apache Tomcat set up on a Windows Server 2003 machine. If I use the command line version (catalina.bat start) it all works fine, but if I try and use it as a Windows Service it seems to pick up the wrong value for JAVA_HOME - it ignores the environment variable I have set, and it's using the runtime path rather than the JDK path. As a result, my scripts won't compile and the app fails to run.
I also wondered whether it might be a registry setting somewhere, but I looked in all the obvious places. HKEY_LOCAL_MACHINE\SOFTWARE\Apache Software Foundation\Procrun 2.0\Tomcat4\Parameters\Java\JavaHome is set to the same as the JAVA_HOME environment variable, as is the JavaHome key under places like JavaSoft\Java Development Kit\1.4 and JavaSoft\Java Runtime Environment\1.4.2_19.
I would check in appwiz.cpl whether there is JRE 1.6* installed on the machine - because if it is, then JAVA_HOME is not anymore taken from the environment variables but from the registry entry created by JRE 1.6 installation. (In worst case you can edit %TOMCAT_HOME%/bin/catalina.bat and set JAVA_HOME that points to your good JDK there///)
Fred Kleinschmidt wrote:If the file in question is one that is a fixed input file for the program, the file should be included with the compiled code in a jar file that the user executes. Then there is no need to fool around with environment variables.
Paul Clapham wrote:If all of this discussion is in aid of your application being able to save a file, then you don't need any environment variables. Knute already mentioned how to deal with temporary files in Java, but if you want to save a file permanently (i.e. it will still be there the next time the application runs) then you can put it in the user's home directory. You can find a path to that directory like this:
String userHomeDirectory = System.getProperty("user.home");
The system PATH environment variable takes precedence over the user PATH. Thus, if a system has a per-machine and a per-user Azul Zulu instances both added to user/system PATH, calling Java from an arbitrary location runs the per-machine Azul Zulu instance.
per-machine installation creates Azul Zulu keys and Generic keys. Generic keys are typically created by Java installers and are used to ensure Azul Zulu is compatible with other tools such as Launch4j and WinRun4J.
The MSI Installer creates registry keys during Azul Zulu installation and removes these keys during uninstallation. Please note that the MSI Installer creates the Generic keys only if Oracle Java has not yet been installed on the computer. If Java is already installed, this means that the keys exist, and the installer does not overwrite them.
If you installed Azul Zulu using the MSI installer, you can upgrade it by followingthe same installation instructions.Note that you can upgrade within the same major version, for example from 8.52 to 8.54.If you install a different major version of Azul Zulu, such as 11, the installer does not remove the previous one but simply adds the new version to your machine.
In the dialog that opens, add the bin folder of your Azul Zulu installation (the directory where you unpacked the .zip file). Make sure the bin folder is placed at the top of the list as shown in the image below:
Configuring the build environment is a powerful way to customize the build process.There are many mechanisms available.By leveraging these mechanisms, you can make your Gradle builds more flexible and adaptable to different environments and requirements.
System Property: Gradle creates specially-named system properties for project properties which you can set using the -D command line flag or gradle.properties file. For the project property prop, the system property created is called org.gradle.project.prop.
Environment Variables: You can set project properties with environment variables. If the environment variable name looks like ORG_GRADLE_PROJECT_prop=somevalue, then Gradle will set a prop property on your project object, with the value of somevalue.
Command Line: Using the -D command-line option, you can pass a system property to the JVM, which runs Gradle.The -D option of the gradle command has the same effect as the -D option of the java command.
The final configuration considered by Gradle is a combination of all Gradle properties set on the command line and your gradle.properties files.If an option is configured in multiple locations, the first one found in any of these locations wins:
Specifies the Java home for the Gradle build process.The value can be set to either a jdk or jre location; however, using a JDK is safer depending on what your build does.This does not affect the version of Java used to launch the Gradle client VM.
Specifies the JVM arguments used for the Gradle Daemon.The setting is particularly useful for configuring JVM memory settings for build performance.This does not affect the JVM settings for the Gradle client VM.
The Kotlin delegated properties are part of the Gradle Kotlin DSL.You need to explicitly specify the type as String.If you need to branch depending on the presence of the property, you can also use String? and check for null.
But I think logstash still works with the JAVA_HOME that it's defined in the System environment variables (It's Windows, yes). Because it prints out as error that Error: Could not find or load main class Files\Java\jre7\lib\ext\QTJava.zip; and the error goes on... C:\Program Files\Java\jre7 is the JAVA_HOME from the System variables.
I tried many other things.. With double quotes, without double quotes, set JAVA_HOME in logstash.bat, set JAVA directly to the java.exe in setup.bat, mix them, change them, try other combinations etc but no. None of them works like in the Elasticsearch. I just set my custom JAVA_HOME in elasticsearch.bat and voiala, it just works!
Simplify this, instead of modifying the original logstash.bat file add another logstash.bat file in a different folder, add JAVA_HOME at the start of that bat file, then call the real logstash.bat file. That way you can switch between logstash and java versions easily by just modifying your custom logstash.bat file
A Java function is a public method, decorated with the annotation @FunctionName. This method defines the entry for a Java function, and must be unique in a particular package. The package can have multiple classes with multiple public methods annotated with @FunctionName. A single package is deployed to a function app in Azure. In Azure, the function app provides the deployment, execution, and management context for your individual Java functions.
The concepts of triggers and bindings are fundamental to Azure Functions. Triggers start the execution of your code. Bindings give you a way to pass data to and return data from a function, without having to write custom data access code.
If you prefer command line development from the Terminal, the simplest way to scaffold Java-based function projects is to use Apache Maven archetypes. The Java Maven archetype for Azure Functions is published under the following groupId:artifactId: com.microsoft.azure:azure-functions-archetype.
The version of Java on which your app runs in Azure is specified in the pom.xml file. The Maven archetype currently generates a pom.xml for Java 8, which you can change before publishing. The Java version in pom.xml should match the version on which you've locally developed and tested your app.
You must have the JAVA_HOME environment variable set correctly to the JDK directory that is used during code compiling using Maven. Make sure that the version of the JDK is at least as high as the Java.version setting.
Microsoft and Adoptium builds of OpenJDK are provided and supported on Functions for Java 8 (Adoptium), Java 11, 17 and 21 (MSFT). These binaries are provided as a no-cost, multi-platform, production-ready distribution of the OpenJDK for Azure. They contain all the components for building and running Java SE applications.
For local development or testing, you can download the Microsoft build of OpenJDK or Adoptium Temurin binaries for free. Azure support for issues with the JDKs and function apps is available with a qualified support plan.
If you would like to continue using the Zulu for Azure binaries on your Function app, configure your app accordingly. You can continue to use the Azul binaries for your site. However, any security patches or improvements are only available in new versions of the OpenJDK. Because of this, you should eventually remove this configuration so that your apps use the latest available version of Java.
Azure Functions supports the use of third-party libraries. By default, all dependencies specified in your project pom.xml file are automatically bundled during the mvn package goal. For libraries not specified as dependencies in the pom.xml file, place them in a lib directory in the function's root directory. Dependencies placed in the lib directory are added to the system class loader at runtime.
The com.microsoft.azure.functions:azure-functions-java-library dependency is provided on the classpath by default, and doesn't need to be included in the lib directory. Also, azure-functions-java-worker adds dependencies listed here to the classpath.
This function gets triggered whenever there's new data in the configured event hub. Because the cardinality is set to MANY, the function receives a batch of messages from the event hub. EventData from event hub gets converted to TestEventData for the function execution.
In the preceding example, the queryValue is bound to the query string parameter name in the HTTP request URL, http://example.host/api/metadata?name=test. Here's another example, showing how to bind to Id from queue trigger metadata.
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