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https://issues.apache.org/jira/browse/NETBEANS-3209?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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John Neffenger resolved NETBEANS-3209.
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Resolution: Fixed
Fixed in the GitHub README file and on the Web site page about building from
source.
> Add JAVA_HOME and ANT_HOME note
> -------------------------------
>
> Key: NETBEANS-3209
> URL: https://issues.apache.org/jira/browse/NETBEANS-3209
> Project: NetBeans
> Issue Type: Improvement
> Components: website
> Affects Versions: 11.2
> Environment: N/A
> Reporter: John Neffenger
> Assignee: John Neffenger
> Priority: Minor
> Labels: pull-request-available, website
> Time Spent: 1h 20m
> Remaining Estimate: 0h
>
> This is a request to add a brief note about the JAVA_HOME and ANT_HOME
> environment variables to the build instructions on the Web site and the
> GitHub repository. The changes on the two pages are as follows:
> [Apache NetBeans source and daily
> builds|https://netbeans.apache.org/download/dev/index.html]
> You can of course build Apache NetBeans from source. To do so:
> # Clone the [https://github.com/apache/netbeans] GitHub repository.
> # Install Oracle’s Java or Open JDK (v8, v11).
> # Install Apache Ant 1.10 or greater ([https://ant.apache.org/]).
> # Set JAVA_HOME and ANT_HOME appropriately or leave them undefined.
> [Apache NetBeans|https://github.com/apache/netbeans/blob/master/README.md]
> (GitHub README.md)
> Requirements
> * Git
> * Ant 1.9.9 or above
> * JDK 8 or 11 (to build NetBeans)
> * JDK 9 or above (to run NetBeans)
> * MinGW (optional), to build Windows Launchers
> *Note:* Set JAVA_HOME and ANT_HOME appropriately or leave them undefined.
> The hidden effect of the JAVA_HOME and ANT_HOME environment variables can be
> a trap for developers not familiar with their use by Apache Ant. The build
> fails if JAVA_HOME or ANT_HOME point to a different version than the one
> required by NetBeans, even when the correct version is found on the PATH
> environment variable.
> Ant will override whatever is found on the PATH with the values of JAVA_HOME
> or ANT_HOME, as shown below:
> {noformat}
> $ which ant
> /usr/bin/ant
> $ ant -diagnostics | grep -e ant.version -e java.version
> ant.version: Apache Ant(TM) version 1.9.6 compiled on July 20 2018
> ant.java.version: 1.8
> java.version : 1.8.0_222
> $ export JAVA_HOME=$HOME/opt/jdk-13
> $ export ANT_HOME=$HOME/opt/apache-ant-1.10.7
> $ which ant
> /usr/bin/ant
> $ ant -diagnostics | grep -e ant.version -e java.version
> ant.version: Apache Ant(TM) version 1.10.7 compiled on September 1 2019
> ant.java.version: 13
> java.version : 13
> java.version.date : 2019-09-17
> {noformat}
> Now that a new JDK is released every six months, the JAVA_HOME environment
> variable on a developer's workstation is more likely to point to a version
> other than JDK 8 or 11 required by NetBeans. And because NetBeans is a
> graphical application often run and debugged from another copy of NetBeans,
> it is more likely to be built directly on a developer's workstation rather
> than on a separate build system.
> Please see the following message from the mailing list for details:
> [Re: Building NetBeans 11.1 from source fails with compile
> errors|https://mail-archives.apache.org/mod_mbox/netbeans-dev/201910.mbox/%3C26c1f141-b021-4473-059f-41ec0b5e3613%40status6.com%3E]
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