On 11/27/2017 11:00 AM, Ed Greshko wrote:
On 11/27/17 16:53, cen wrote:
On 11/27/2017 01:51 AM, Ed Greshko wrote:
On 11/27/17 07:39, Ed Greshko wrote:
I suppose I could give it a try with java-9 on a VM.  If that is what you require.
As previously noted.  I got....

[egreshko@acer ~]$ mvn -v
Apache Maven 3.5.0 (Red Hat 3.5.0-6)
Maven home: /usr/share/maven
Java version: 1.8.0_151, vendor: Oracle Corporation
Java home: /usr/lib/jvm/java-1.8.0-openjdk-1.8.0.151-1.b12.fc27.x86_64/jre
Default locale: en_US, platform encoding: UTF-8
OS name: "linux", version: "4.13.15-300.fc27.x86_64", arch: "amd64", family: "unix"

on my default testing system.

Note that the Java home points to a "jre" directory.

Installing java-9 on a VM shows there to be no jre supplied with java-9.  So, I think
one must be content with running java-1.8 with maven.

That can't be true because I used maven with java 9 in F26 from updates-testing
with absolutely no problems. And I have same problem with java 8 anyway.

After removing all versions of java and maven with dnf I tried to do a fresh
install and now even that fails:

Install package 'maven' to provide command 'mvn'? [N/y] y


 * Waiting in queue...
 * Loading list of packages....
 * Downloading details about the software sources....
 * Loading list of packages....
 * Downloading details about the software sources....
 * Loading list of packages....
The following packages have to be installed:
 java-1.8.0-openjdk-devel-1:1.8.0.151-1.b12.fc27.x86_64    OpenJDK Development
Environment
 maven-1:3.5.0-6.fc27.noarch    Java project management and project comprehension tool
Proceed with changes? [N/y] y


 * Waiting in queue...
 * Waiting for authentication...
 * Waiting in queue...
 * Downloading packages...
 * Requesting data...
 * Testing changes...
 * Installing packages...
/usr/bin/mvn: Failed to set JAVACMD
The JAVA_HOME environment variable is not defined correctly
This environment variable is needed to run this program
NB: JAVA_HOME should point to a JDK not a JRE

Something on my system seems to be off and I have no idea what. 

2 things.  First, you noticed that part of the message you got during the install
says.... 

The following packages have to be installed:
 java-1.8.0-openjdk-devel-1:1.8.0.151-1.b12.fc27.x86_64    OpenJDK Development
Environment

Which is telling you that maven is depending on java-1.8.

Second, a question.  When you ran the command did you have JAVA_HOME set?  If you
did, how about trying it again without it being set?



Yes, apparently I did have JAVA_HOME set. After unsetting the variable and reinstalling maven again it completed successfully. However, problem persists:

mvn -version
/usr/bin/mvn: Failed to set JAVACMD
The JAVA_HOME environment variable is not defined correctly
This environment variable is needed to run this program
NB: JAVA_HOME should point to a JDK not a JRE


One other thing I found after install is this:
pwd
/usr/lib/jvm/java-1.8.0-openjdk-1.8.0.151-1.b12.fc27.x86_64/bin
./java -version
Error: could not find libjava.so
Error: Could not find Java SE Runtime Environment.


So this java 8 install as a weak maven dependency seems to be borked.



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