8389584: Allow a shared Gradle properties

.gitignore

@@ -6,13 +6,15 @@ Release/
 bin/
 build/
 dist/
-gradle.properties
 testbin/
 **/Ensemble8/lib/
 **/Ensemble8/src/generated/resources/ensemble/search/index/write.lock
 **/nbproject/private/
 hs_err_pid*
 
+# JavaFX user-local properties for the build 
+gradle-local.properties
+
 # Ignore webrevs
 /webrev/
 /webrev.zip

build.gradle

@@ -165,6 +165,29 @@ void loadProperties(String sourceFileName) {
     }
 }
 
+/**
+ * Reads the JavaFX local user properties file (gradle-local.properties).
+ */
+void loadLocalProperties(String sourceFileName) {
+    def propFile = new File(sourceFileName)
+    if (!propFile.canRead()) {
+        return
+    }
+
+    def localProps = new Properties()
+    propFile.withInputStream { localProps.load(it) }
+
+    def cliProps = gradle.startParameter.projectProperties
+    localProps.forEach((name, value) -> {
+        if (cliProps.containsKey(name)) {
+            logger.info("gradle-local.properties: $name overriden by CLI arg")
+            return
+        }
+        ext[name] = value
+        logger.info("gradle-local.properties: defined $name=$value")
+    })
+}
+
 /**
  * Struct used to contain some information passed to the closure
  * passed to compileTargets.
@@ -308,6 +331,7 @@ void setFileTimestamps(Provider<RegularFile> archive, Instant instant) {
  *****************************************************************************/
 
 loadProperties("$projectDir/build.properties")
+loadLocalProperties("$projectDir/gradle-local.properties")
 
 // If the ../rt-closed directory exists, then we are doing a closed build.
 // In this case, build and property files will be read from

gradle.properties.template → gradle-local.properties.template

@@ -26,8 +26,11 @@
 #####################################################################################
 #                                                                                   #
 # This properties file allows for a developer to override various properties used   #
-# when building JavaFX. Any settings you configure in the gradle.properties file    #
-# will have precedence over any values specified in the build script itself.        #
+# when building JavaFX. Any settings you configure in the gradle-local.properties   #
+# file will have precedence over any values specified in the build script itself.   #
+# Don't place Gradle properties (org.gradle.*) or system properties (systemProp.*)  #
+# here as they will be read too late. Either pass them with -D, set GRADLE_OPTS,    #
+# or put them in <GRADLE_USER_HOME>/gradle.properties.                              #
 #                                                                                   #
 #####################################################################################
 

gradle.properties

@@ -0,0 +1,27 @@
+#
+# Copyright (c) 2026, Oracle and/or its affiliates. All rights reserved.
+# DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
+#
+# This code is free software; you can redistribute it and/or modify it
+# under the terms of the GNU General Public License version 2 only, as
+# published by the Free Software Foundation.  Oracle designates this
+# particular file as subject to the "Classpath" exception as provided
+# by Oracle in the LICENSE file that accompanied this code.
+#
+# This code is distributed in the hope that it will be useful, but WITHOUT
+# ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+# FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+# version 2 for more details (a copy is included in the LICENSE file that
+# accompanied this code).
+#
+# You should have received a copy of the GNU General Public License version
+# 2 along with this work; if not, write to the Free Software Foundation,
+# Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
+#
+# Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
+# or visit www.oracle.com if you need additional information or have any
+# questions.
+#
+
+# Search for Java installations also in JDK_HOME - required for using the Java Toolchain
+org.gradle.java.installations.fromEnv=JDK_HOME