In Ubuntu, How to set Tomcat 9 to use Java 17? - linux

As the title described, in Ubuntu 20.04 how to set Tomcat 9 to use Java 17 ?
Recently I repacked the war file of my web project with Spring Boot 3.0.1 which requires Java 17 to run, trying to deploy it to Tomcat 9 container at an Ubuntu 20.04 server.
It seems that the best way is to utilize the setenv.sh.
I've followed some documents,
created a folder bin in /usr/share/tomcat9, touched file of setenv.sh,
edited its content with JAVA_HOME=/usr/lib/jvm/java-17-openjdk-amd64.
Then run sudo systemctl start tomcat9, but failed.
sudo systemctl status tomcat9 said "No JDK or JRE found - Please set the JAVA_HOME variable or install the default-jdk package",
Installed openjdk-17-jre-headless, and removed openjdk-11-jre-headless at first. Both Tomcat9 and JRE 17 is installed by apt package manager.

Even if you managed to run tomcat 9 with java 17, a web app using spring boot 3.x or spring framework 6.x would still not be able to run there.
Reason is that starting with spring boot 3.0 or spring framework 6.0 the web application needs to conform to jakarta servlet api. According to doc for tomcat the jakarta servlet api (servlet v5.0) is supported from tomcat 10 and later.
As described in doc
Apache Tomcat 10.0.x
Apache Tomcat 10.0.x builds on Tomcat 9.0.x and
implements the Servlet 5.0, JSP 3.0, EL 4.0, WebSocket 2.0 and
Authentication 2.0 specifications (the versions required by Jakarta EE
9 platform).
So you have to use tomcat 10 instead of tomcat 9.

Related

deploy webapp running in tomcat5 into tomcat7

we have an instance of tomcat running on solaris 10 version 5. we do not have a war file or anything..
I installed a new server linux centOS and i am try to deploy the app on this new server..
we do not have any war file since the app is very old running without issue since 2005 but due to some component deprecating tls 1.0 we need to adapt it and we take the opportunity to instal in a more recent version.

Overwrite Jboss jar with Maven dependencies

Hi we have to use JBoss 6.4, But when I try to execute my code it fails due to missing method and works fine with JBoss 6.3 and JBoss 7
the setSSLContext method became available in v4.5 of HttpClientBuiler.
JBOSS 6.4 comes bundled with v4.3.6JBOSS 6.4 comes bundled with v4.3.6
So if I use version 4.5.2 via maven, does it override all the JBoss methods. If not what is the solution?
I want to use JBoss 6.4 only.
If you want to want to use any other version of components which is not bundled with specific Jboss release, then you can create it as module dependencies and use it. Make sure that you should exclude the particular version of components which bundle with JBoss inside jboss-deployment-structure.xml file
see the link: https://docs.jboss.org/author/display/AS7/Class+Loading+in+AS7

What's the location of the JavaFX runtime JAR file, jfxrt.jar, on Linux?

I'm trying to run some JavaFX code with Eclipse Kepler, with e(fx)clipse plugin installed, on a Linux machine, using:
java version "1.7.0_21"
OpenJDK Runtime Environment (IcedTea 2.3.9) (7u21-2.3.9-5)
OpenJDK 64-Bit Server VM (build 23.7-b01, mixed mode)
My understanding is that although JavaFX has been included with the standard JDK since version JDK 7u6, the JavaFX runtime JAR file, jfxrt.jar, was left off of the Java runtime path on purpose until further testing between JavaFX and rest of the java infrastructure has been completed. For this reason you must manually add it to the project build path libraries when we create a new Java project.
I've been looking for that jar in both the following directories without success:
/usr/lib/jvm/java-7-openjdk-common/jre/lib/
/usr/lib/jvm/java-7-openjdk-amd64/lib
Where else should I look for it?
Update March 2021
The previous information in this answer is now obsolete for later versions of Java and JavaFX (e.g. Java 11+). This update provides info for more recent versions.
JavaFX is now available from openjfx.io or the public Maven repository as an SDK or a library set, or a module set. JavaFX has been partitioned into a set of dependencies rather than a monolithic jfxrt.jar library distributed with the Java runtime (as was previously the case with Oracle Java 8 for instance).
With versions 11+ of JavaFX, the location of the JavaFX jar files (and the native libraries to accompany them) will depend on how you build your project. For example:
If you use a build tool such as Maven or Gradle and specify JavaFX as a dependency, then the JavaFX jar files will be downloaded into your local Maven or Gradle repository (the same as other maven dependencies).
If you download the JavaFX SDK from openjfx.io (gluon), then the JavaFX jar files will be in the location you unzipped the SDK to.
The location of jfxrt.jar in Oracle Java 7 is:
<JRE_HOME>/lib/jfxrt.jar
The location of jfxrt.jar in Oracle Java 8 is:
<JRE_HOME>/lib/ext/jfxrt.jar
The <JRE_HOME> will depend on where you installed the Oracle Java and may differ between Linux distributions and installations.
jfxrt.jar is not in the Linux OpenJDK 7 (which is what you are using).
An open source package which provides JavaFX 8 for Debian based systems such as Ubuntu is available. To install this package it is necessary to install both the Debian OpenJDK 8 package and the Debian OpenJFX package. I don't run Debian, so I'm not sure where the Debian OpenJFX package installs jfxrt.jar.
Use Oracle Java 8.
With Oracle Java 8, JavaFX is both included in the JDK and is on the default classpath. This means that JavaFX classes will automatically be found both by the compiler during the build and by the runtime when your users use your application. So using Oracle Java 8 is currently the best solution to your issue.
OpenJDK for Java 8 could include JavaFX (as JavaFX for Java 8 is now open source), but it will depend on the OpenJDK package assemblers as to whether they choose to include JavaFX 8 with their distributions. I hope they do, as it should help remove the confusion you experienced in your question and it also provides a great deal more functionality in OpenJDK.
My understanding is that although JavaFX has been included with the standard JDK since version JDK 7u6
Yes, but only the Oracle JDK.
The JavaFX version bundled with Java 7 was not completely open source so it could not be included in the OpenJDK (which is what you are using).
In you need to use Java 7 instead of Java 8, you could download the Oracle JDK for Java 7 and use that. Then JavaFX will be included with Java 7. Due to the way Oracle configured Java 7, JavaFX won't be on the classpath. If you use Java 7, you will need to add it to your classpath and use appropriate JavaFX packaging tools to allow your users to run your application. Some tools such as e(fx)clipse and NetBeans JavaFX project type will take care of classpath issues and packaging tasks for you.
Mine were located here on Ubuntu 18.04 when I installed JavaFX using apt install openjfx (as noted already by #jewelsea above)
/usr/share/java/openjfx/jre/lib/ext/jfxrt.jar
/usr/lib/jvm/java-8-openjdk-amd64/jre/lib/ext/jfxrt.jar
On Ubuntu with OpenJDK, it installed in /usr/lib/jvm/default-java/jre/lib/ext/jfxrt.jar (technically its a symlink to /usr/share/java/openjfx/jre/lib/ext/jfxrt.jar, but it is probably better to use the default-java link)
The location of jfxrt.jar in JDK 1.8 (Windows) is:
C:\Program Files\Java\jdk1.8.0_05\jre\lib\ext\jfxrt.jar

Java EE 7 SDK with JDK Ubuntu Server 12.04

I am trying to install Java EE 7 SDK with JDK as see downloaded from here
I am getting this error:
"Can't connect to X11 winder server using '0' as the value of the variable"
as this is a server, I don't want to have a GUI. Is there there no other way to install this without a GUI for Ubuntu Server 12.04 ?
I am trying to get glassfish 4.0 up and working on here ultimately, with a My-Sql Cluster setup.
Download and install Glassfish as described on https://glassfish.java.net/download.html
It is just unzipping a file.

Can i install JBOSS SOA-P into existed JBOSS EAP 5.1?

On my server UBUNTU SERVER 12.04 LTS, I installed JBoss EAP 5.1, and everything is working perfectly. Now I need to install JBOSS ESB, JBPM and JBoss Web Services. These 3 packages (except perhaps JBoss Web Services) are contained in JBoss SOA-P 5.2.
Given that JBoss SOA-P also contains JBoss EAP, how do I proceed? Is there a way to install individual packages missing, or can I install SOA-P on EAP? How?
If you have SOA-P 5.2 then I would just install and use that. EAP is included in the SOA-P and everything else you need, i.e. web services etc. should be in the jboss tools (I get them from the nightlies update site aka jboss soa tools). What is your end goal? Do you have a specific project or set of projects that are EAP specific?
also see this: JBoss Enterprise Application Platform vs JBoss Enterprise SOA Platform

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