Re: Java 8 Jdk Install Windows 10
Macabeo Eastman
They provide native MSI installers which should be easier to deploy and they include support for setting reg keys the same as Oracle Java for dealing with any apps that explicitly check for these keys during install to verify java is installed.
Yes, this is OpenJDK which is the FOSS version (but still binary compatible with Oracle Java), when you install it make sure you tell it to set the Oracle reg keys (FeatureOracleJavaSoft if you are using commandline options), as most software will check these keys to detect if Java is installed.
Sometimes, attempts to uninstall JDK through the Windows Add/Remove program leave behind some Java entries in the registry that are not fully removed. These left behind registry entries can cause problems in installing a new version of Java. The following are the methods to cleanup registry entries:
To save the registry key before deleting, in the menu bar, select File and then Export. In case you deleted the wrong registry key, you can restore the registry from your saved backup file by selecting from the menu bar File and then Import .
When you install JDK 22 and then install JRE 8, and then run the java -version command, 1.8.0 is displayed in the output instead of 22. This is because the javapath is placed before JDK 22 location in the user environment path.
So my problem is that I switched from java 8 to java 17 recently (I required java 8 for a course), but I noticed that on ubuntu terminals, java -version still showed openjdk-1.8.(something), rather than jdk-17 or something like that.
So I thought that uninstalling openjdk would do the trick, which I did with sudo apt-get autoremove openjdk-8-jre. However, now typing java in an ubuntu terminal doesn't work anymore at all, and shows: Command 'java' not found, but can be installed with: .... But I fear that installing it with one of these commands will install a new version of java, rather than using the one that's already installed.
There are a few... unique things about WSL that matter here. First, if you type the name of a .exe that is in the Windows side, but from WSL, it will work. For example, open a Bash prompt in WSL, type notepad.exe, and press enter. Notepad will open.
Before you uninstalled OpenJDK 8, you had openjdk-8-jre installed in WSL and Java 17 installed in Windows. When you called java from Windows, it was smart enough to add the .exe, and run the Windows copy of Java. But, when you switched to WSL, when you typed java, it ran the Linux version. But if you typed (into WSL) java.exe, it would have launched the Windows version of Java from WSL for the same reason that Notepad worked.
If I wanted to do Java development from WSL, I would uninstall the Windows version of Java completely, install my desired version of Java in WSL (sudo apt update && sudo apt install openjdk-17-jre), and just do development from in WSL via the WSL Java compiler.
I know in download folder we have something processing-java.exe, when I double clicks on it. A black window opens and close within fraction of seconds. After this I try executing command processing-java in CMD (aka terminal) I am getting following messages.
I tried opening processing-java.exe in notepad (crazy idea!) I find something like, "Classpath not defined." and "This application was configured to use a bundled Java Runtime Environment but the runtime is missing or corrupted. If running from a folder with non-ASCII characters, try moving this folder to another location. Required files could not be found. If running from a folder with non-ASCII characters, try moving this folder to another location. The registry refers to a nonexistent Java installation or the runtime is corrupted."
I was wondering if we need to create new environment variable for processing-java? can you please tell exactly what steps you performed to install the same on your windows machine. If it is working for you then I must be doing something silly.
To get to the dialog box displayed in the previous post, you need to access Advanced System Settings, which you can access it by typing it in the search bar right after you click your Windows logo. Then, you click in the button right at the bottom: Environmental variables... and you get the dialog that is displayed in the previous post.
How do I get Gradle to detect available JDKs on Windows? From the documentation there is nothing mentioned of any configuration for Toolchain to work on Windows.
Other that to specify custom toolchain locations
org.gradle.java.installations.paths=C:\Program Files\Java\jdk-11,C:\Program Files\Java\jdk-14,C:\Program Files\Java\jdk-15,C:\Program Files\Java\jdk-16
I just tried to unpack the JDKs under C:\Users\myuser\.gradle/jdks
Running gradlew.bat -q javaToolchains does not list them, but the build does not fail. The toolchain I have defined in build.gradle for JDK-14 is used.
I installed OpenJDK 11, 14, 15 and 16 using the MSI installers.
Checked to update registry for all of them.
Running Gradle with JDK 11. JDK 11 also has the JAVA_HOME.
Gradle now lists all these as toolchains.
Recent versions of Java on Windows have changed the way that Java is installed. Now it creates a C:\ProgramData\Oracle\Java\javapath folder that is added to the PATH, then this folder contains symlinks to for each of java.exe, javaw.exe, and javaws.exe (the main Java executables) over to wherever they are installed on the file system (typically in C:\Program Files or perhaps C:\Java). This is a nice idea so that people are constantly fiddling with their PATH to configure it to a specific versioned Java install (complete with major, minor, and build numbers).
The simplest way to install Jenkins on Windows is to use the Jenkins Windows installer.That program will install Jenkins as a service using a 64 bit JVM chosen by the user.Keep in mind that to run Jenkins as a service, the account that runs Jenkins must have permission to login as a service.
Refer to the Windows section of theDownloading Jenkins pageto download either an LTS release or a weekly release of the Windows installer.After the download completes, open the Windows installer and follow the steps below to install Jenkins.
When Installing Jenkins, it is recommended to install and run Jenkins as an independentwindows service using a local or domain user as it is much safer than running Jenkinsusing LocalSystem(Windows equivalent of root) which will grant Jenkins full accessto your machine and services.
To run Jenkins service using a local or domain user, specify the domain user name andpassword with which you want to run Jenkins,click on Test Credentials to test your domain credentials and click on Next.
Specify the port on which Jenkins will be running,Test Port button to validate whether the specified port if free on your machine or not.Consequently, if the port is free, it will show a green tick mark as shown below,then click on Next.
The installation process checks for Java on your machine and prefills the dialog with theJava home directory.If the needed Java version is not installed on your machine, you will be prompted to install it.
MSI installers can be installed via a silent method, which can show basic UI (/qb) or no UI at all (/qn). The silent method does not prompt for user input so there are properties that you can pass to the installer to set the specific values. A very basic command line is shown below for a silent install.
When installing a service to run under a domain user account, the account must have the right to logon as a service. This logon permission applies strictly to the local computer and must be granted in the Local Security Policy.
The main difference between OpenJdk and OracleJDK is licensing. OpenJDK is completely open source with a GNU General Public License. OracleJDK requires a commercial license from Oracle. Since 2019, businesses need to purchase a commercial license in order to receive software updates.
JRE (Java Runtime), which include a Java Virtual Machine and core libraries, is needed for running Java programs. JDK (Java Development Kit), which includes JRE plus the development tools (such as compiler and debugger), is need for developing and running Java programs. In other words, JRE is a subset of JDK. Since you are supposed to write Java Programs instead of merely running Java programs, you should install JDK, which includes JRE.
Prior to JDK 15, you need to explicitly add JDK's "bin" into the PATH. Starting from JDK 15, the installation process adds the directory "C:\Program Files\Common Files\Oracle\Java\javapath" to the PATH. The "javapath" directory is a link to "javapath_target_xxxxxx", which contains a copy of the following JDK programs:
Source code for JDK is provided and kept in "\lib\src.zip" (or "\src.zip" prior to JDK 9). I strongly recommend that you to go through some of the source files such as "String.java", "Math.java", and "Integer.java", under "java\lang", to learn how experts program.
The above steps set up symlinks java, javac, jshell at /usr/bin (which is in the PATH), that link to /etc/alternatives and then to JDK bin directory. The "alternatives" system aims to resolve the situation where several programs fulfilling the same function (e.g., different version of JDKs). It sets up symlinks thru /etc/alternatives to refer to the default programs to be used.
External Java API packages (such as Servlet API, MySQL Connector/J, JOGL, JUnit) are often distributed in JAR files (Java Archive - a single-file package of many Java classes similar to ZIP or TAR), with possibly Native Libraries (".lib" and ".dll" in Windows, or ".a" and ".so" in Linux/macOS).
Native libraries are not involved in the compilation. But if they are not properly included during runtime time, you will get a runtime error "java.lang.UnsatisfiedLinkError: no xxx in java.library.path".
When you have installed a 64-bit LibreOffice, and 32-bit JRE, LibreOffice would not be able to find and use the JRE, no matter how hard you would try it. Take care that you download from the Java home page (www.java.com) the right architecture. In this case, LibreOffice (of reasonably fresh version) would try to be helpful in its "JRE Required" error message, telling you that it needs specific architecture (e.g., 64-bit) of JRE.
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