From 338f2ae9f3674f9640626b576f62d590325299b3 Mon Sep 17 00:00:00 2001
From: Georgios Andrianakis <geoand@gmail.com>
Date: Fri, 10 Sep 2021 09:22:46 +0300
Subject: [PATCH] Be more intelligent about locating java for
 @QuarkusIntegrationTest

Fixes: #20049
---
 .../test/common/DefaultJarLauncher.java       | 26 ++++++++++++++++++-
 1 file changed, 25 insertions(+), 1 deletion(-)

diff --git a/test-framework/common/src/main/java/io/quarkus/test/common/DefaultJarLauncher.java b/test-framework/common/src/main/java/io/quarkus/test/common/DefaultJarLauncher.java
index 92074dcc385be..10958e167ad83 100644
--- a/test-framework/common/src/main/java/io/quarkus/test/common/DefaultJarLauncher.java
+++ b/test-framework/common/src/main/java/io/quarkus/test/common/DefaultJarLauncher.java
@@ -5,6 +5,7 @@
 import static io.quarkus.test.common.LauncherUtil.waitForCapturedListeningData;
 import static io.quarkus.test.common.LauncherUtil.waitForStartedFunction;
 
+import java.io.File;
 import java.io.IOException;
 import java.nio.file.Files;
 import java.nio.file.Path;
@@ -19,7 +20,10 @@
 
 public class DefaultJarLauncher implements JarArtifactLauncher {
 
+    private static final String JAVA_HOME_SYS = "java.home";
+    private static final String JAVA_HOME_ENV = "JAVA_HOME";
     private static final String VERTX_HTTP_RECORDER = "io.quarkus.vertx.http.runtime.VertxHttpRecorder";
+
     static boolean HTTP_PRESENT;
 
     static {
@@ -92,7 +96,7 @@ public void start(String[] programArgs, boolean handleIo) throws IOException {
         System.setProperty("test.url", TestHTTPResourceManager.getUri());
 
         List<String> args = new ArrayList<>();
-        args.add("java");
+        args.add(determineJavaPath());
         if (!argLine.isEmpty()) {
             args.addAll(argLine);
         }
@@ -129,6 +133,26 @@ public void start(String[] programArgs, boolean handleIo) throws IOException {
 
     }
 
+    private String determineJavaPath() {
+        // try system property first - it will be the JAVA_HOME used by the current JVM
+        String home = System.getProperty(JAVA_HOME_SYS);
+        if (home == null) {
+            // No luck, somewhat a odd JVM not enforcing this property
+            // try with the JAVA_HOME environment variable
+            home = System.getenv(JAVA_HOME_ENV);
+        }
+        if (home != null) {
+            File javaHome = new File(home);
+            File file = new File(javaHome, "bin/java");
+            if (file.exists()) {
+                return file.getAbsolutePath();
+            }
+        }
+
+        // just assume 'java' is on the system path
+        return "java";
+    }
+
     @Override
     public boolean listensOnSsl() {
         return isSsl;