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From: Geert Stappers <stappers@stappers.nl>
Newsgroups: linux.debian.maint.java
Subject: Re: Setting  JAVA_HOME
Date: Sun, 28 Feb 2021 15:20:02 +0100
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On Sun, Feb 28, 2021 at 02:43:34PM +0100, Thorsten Glaser wrote:
> On Sun, 28 Feb 2021, Geert Stappers wrote:
> 
> > To what should JAVA_HOME be set?
> 
> It should be unset. Also ideally, you have only ever one JRE installed.
> 
> Everything else is a nightmare.

    :-)


> To make this work with Java >8 and Maven, you’ll need¹…
> 
> 	<profile>
> 		<id>jre-not-below-jdk</id>
> 		<activation>
> 			<file>
> 				<exists>${java.home}/bin/javadoc</exists>
> 			</file>
> 		</activation>
> 		<build>
> 			<plugins>
> 				<plugin>
> 					<groupId>org.apache.maven.plugins</groupId>
> 					<artifactId>maven-javadoc-plugin</artifactId>
> 					<configuration>
> 						<javadocExecutable>${java.home}/bin/javadoc</javadocExecutable>
> 					</configuration>
> 				</plugin>
> 			</plugins>
> 		</build>
> 	</profile>
> 
> … or the Debian-patched version of the maven-javadoc-plugin.
> 


Sharing my "nightmare" with you

| $ javaws ~/Downloads/launch\(3\).jnlp 
| Codebase matches codebase manifest attribute, and application is signed. Continuing. See: http://docs.oracle.com/javase/7/docs/technotes/guides/jweb/security/no_redeploy.html for details.
| Starting application [tw.com.aten.ikvm.KVMMain] ...
| Buf size:425984
| Exception in thread "AWT-EventQueue-1" javax.xml.parsers.FactoryConfigurationError: Provider for class javax.xml.parsers.DocumentBuilderFactory cannot be created
| 	at java.xml/javax.xml.parsers.FactoryFinder.findServiceProvider(FactoryFinder.java:305)
| 	at java.xml/javax.xml.parsers.FactoryFinder.find(FactoryFinder.java:261)
| 	at java.xml/javax.xml.parsers.DocumentBuilderFactory.newInstance(DocumentBuilderFactory.java:140)
|  ...Java stack trace...


Manual page of `javaws` mentions JAVA_HOME

With `apt-file search DocumentBuilderFactory` I did found 
| openjdk-11-doc: /usr/share/doc/openjdk-11-jre-headless/api/java.xml/javax/xml/parsers/DocumentBuilderFactory.html
| openjdk-11-doc: /usr/share/doc/openjdk-11-jre-headless/api/java.xml/javax/xml/parsers/class-use/DocumentBuilderFactory.html
| openjdk-15-doc: /usr/share/doc/openjdk-15-jre-headless/api/java.xml/javax/xml/parsers/DocumentBuilderFactory.html
| openjdk-15-doc: /usr/share/doc/openjdk-15-jre-headless/api/java.xml/javax/xml/parsers/class-use/DocumentBuilderFactory.html
| openjdk-16-doc: /usr/share/doc/openjdk-16-jre-headless/api/java.xml/javax/xml/parsers/DocumentBuilderFactory.html
| openjdk-16-doc: /usr/share/doc/openjdk-16-jre-headless/api/java.xml/javax/xml/parsers/class-use/DocumentBuilderFactory.html
| openjdk-17-doc: /usr/share/doc/openjdk-17-jre-headless/api/java.xml/javax/xml/parsers/DocumentBuilderFactory.html
| openjdk-17-doc: /usr/share/doc/openjdk-17-jre-headless/api/java.xml/javax/xml/parsers/class-use/DocumentBuilderFactory.html


Hence the original
> > To what should JAVA_HOME be set?
 

At  https://www.wikihow.com/Set-Java-Home#For-Linux  I found
JAVA_HOME=/usr/java/jdk1.6.0_06/bin/java

But there is no  /usr/java/ on my Debian system.


Transforming
> > Which value has JAVA_HOME  for you?
into


Which sane value for JAVA_HOME  should I try
with next `javaws launch.jnlp` ?



Groeten
Geert Stappers
-- 
Silence is hard to parse