I'm wondering if there is a bug with Jshell.
I have tried all forms of importing the commons lang jar into the classpath trying:
1 - This solution
2 - Also followed this solution too.
I even launched jshell from the directory where the jar itself resides and when I execute a System.getProperty("user.dir") I get the correct path so it is confirmed that I am in the right directory, but I am unable to import the commons lang jar for use in jshell.
At this point I'm wondering if this is a bug.
Relevant system info are:
JDK - Java 17
OS - macOS Monterey (M1 Pro)
Related
When I use Apache-Ant following :
ant -version
Unable to locate tools.jar. Expected to find it in C:\Program Files\Java\jre1.8.0_111\lib\tools.jar
Apache Ant(TM) version 1.10.1 compiled on February 2 2017
However, it works properly but why it shows this and how can I resolve this?
Unable to locate tools.jar. Expected to find it in C:\Program Files\Java\jre1.8.0_111\lib\tools.jar
It is because, you have installed JRE while it is required to install JDK.
Please refer System Requirements of Ant
For the current version of Ant, you will also need a JDK installed on your system, version 1.4 or later required, 1.7 or later strongly recommended. The more up-to-date the version of Java , the more Ant tasks you get.
Note: If a JDK is not present, only the JRE runtime, then many tasks will not work.
So, install JDK and
set JAVA_HOME correctly
add %JAVA_HOME%\bin to PATH
is anyone knows how to change the jre libraries on java dynamic web project(I am using Eclipse and Maven)? The case is this, when I first created the project on Eclipse Oxygen package M5 the default jre was 1.6, I changed the Java Build Path(libraries) into 1.7/1.8, however upon updating the project it always returns to 1.6 and there is a red mark on the project folder. I already tried deleting the project and import it as Existing Maven Project and then update and clean but still nothing happens. This happens whenever I am creating a project without XML based configuration. I installed JDK 1.8.0 update 111, 121, and 131 and Apache Tomcat V7(XAMPP). On my brother's laptop everything works fine.
By the way, I also tried to replace .m2 folder of my laptop by copying .m2 folder from my brother's laptop.
Any help is much appreciated.
I assume you are using m2e, the Maven integration for Eclipse, which offers the import as Existing Maven Project option. m2e takes the version for the JRE System Library container from the configuration of the maven-compiler-plugin; this ensures that Eclipse and mvn behave consistently. Try changing the <source> and <target> configuration options of the maven-compiler-plugin, maybe followed by a Maven > Update Project to make sure m2e has sync’ed the changes to the pom.xml with the Eclipse buildpath.
I would like to check out Dart. Got the windows 7 & 8 zip. Unziped it and fired up the editor.
complained that it needed a java vm. Downladed and installed it and set the reference in the ini.file to the Javaw.exe as instructed here:
-data
#user.home\DartEditor
-vm
D:\\Program Files (x86)\\Java\\jre7\\bin\\javaw.exe
-vmargs
-d64
-Dosgi.requiredJavaVersion=1.6
-Dfile.encoding=UTF-8
-XX:MaxPermSize=128m
-Xms256m
-Xmx2000m
still no joy:
UPDATE
went to 64 Bit java version:
I completely removed all java versions and obtained the latest version for windows 8.1,
added the file location to path and voila.
If you have downloaded the 64bit DartEditor you need a 64bit JRE/JDK.
https://www.dartlang.org/tools/editor/troubleshoot.html
I have both Java 6 and Java 7 installed in my computer running Windows XP sp3. I have entered path in the environment variables (PATH, JAVA_HOME) in My computer-> Properties. But when I give
java -version
I still get the following text
java version "1.7.0_09"
Java(TM) SE Runtime Environment (build
1.7.0_09-b05) Java HotSpot(TM) Client VM (build 23.5-b02, mixed mode, sharing)
However, when I try
javac -version
I get
javac 1.6.0_03
How can I change the runtime from Java 7 to Java 6? When I compile my program in eclipse using ant, I get the following
Warning: java\util\List.class(java\util:List.class): major version 51
is newer than 50, the highest major version supported by this
compiler. [javac] It is recommended that the compiler be upgraded.
Path has the JRE first, thus the java -version and the JDK second, thus the javac -version. Check your PATH variable.
If you want the JDK version, put it first on the PATH.
If am not mistake java 7 windows installer of JDK or JRE will copy java.exe to some windows common path. I don't remember exactly the path but maybe C:\Windows\System32. Try this on command line to know where is the location of java.exe:
where java
Update your path precedence accordingly.
When you install Java (JRE), it copies java.exe into C:\Windows\System32, in addition to installation directory under C:\Program Files. But when you install full JDK (with compiler), it doesn't do that for javac.exe. When you have multiple versions of java, the last installed one will be called when you type java in command line.
Use full paths if you need to have multiple Java versions, you will always have problems trying to use unqualified java in command line. Alternatively, re-install JRE 7 - that will force default java to be V7.
After searching all over the web, I am not able to solve my problem of Java execution. When using command prompt to run my "first" Java program, I am faced with the errors of Unsupported class version and Main class not found. Program will exit.
I have 2 versions of Java on my PC, Java 6 and 7. I have set the path of the JDK 7 in path environment variables and classpath too. I know the problem: I have javac -version as 1.7.02 and java version as 1.6.02, but how to change it and fix the problem?
Please elaborate the problem in easy and understandable language!
You have to run your program with the same or higher version of java that yxou compiled it with.
So you can either compile your program with Java 6 on your PC or run it with java 7.
To run your program with java 7 just use the complete path to your java runtime environment. for instance
c:\jdk7\bin\jawaw.exe yourprogram
How to tell your system which Java version to use is explained here:
Why does java -version returns old version?
JRE [java command] come with your JDK 1.7, and you must change your JAVA_HOME variable to your JDK 1.7 folder.for this work read this article