Hi,


To what should JAVA_HOME be set?

Or: Which value has JAVA_HOME for you?



Yeah, simple things should be simple.



Groeten
Geert Stappers


P.S.

My travelled path
https://wiki.debian.org/Java
https://wiki.debian.org/JavaFAQ
http://www.debian.org/doc/manuals/debian-java-faq/
https://bugs.debian.org/cgi-bin/pkgreport.cgi?pkg=java-common;dist=unstable
--
Silence is hard to parse

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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.

bye,
//mirabilos
① see https://evolvis.org/plugins/scmgit/cgi-bin/gitweb.cgi?p=tartools/mvnparent.git
or use…
<parent>
<groupId>org.evolvis.tartools</groupId>
<artifactId>maven-parent</artifactId>
<version>2.1</version>
</parent>
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This is an OpenPGP/MIME signed message (RFC 4880 and 3156) --l38elY21hbt2KUYhSQGe3JfrZNWuAviXE
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Hello Geert,

at most of my Java packages i set

export JAVA_HOME := /usr/lib/jvm/default-java

in debian/rules

Regards

Mechtilde

Am 28.02.21 um 15:17 schrieb Geert Stappers:

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

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--l38elY21hbt2KUYhSQGe3JfrZNWuAviXE--

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4B9ngDQOC3

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
--
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Le 28/02/2021 à 15:26, Mechtilde a écrit :

at most of my Java packages i set

export JAVA_HOME := /usr/lib/jvm/default-java

in debian/rules

You can remove it from debian/rules, unless you want to build with a
specific JRE (for example Java 8 when Java 11 is the default) that's
useless.

Emmanuel Bourg

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