8329862: libjli GetApplicationHome cleanups and enhance jli tracing

Reviewed-by: clanger, stuefe

Author: MBaesken

src/java.base/unix/native/libjli/java_md.c

@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 1998, 2023, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 1998, 2024, 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
@@ -495,27 +495,19 @@ GetJREPath(char *path, jint pathsize, jboolean speculative)
     char libjava[MAXPATHLEN];
     struct stat s;
 
+    JLI_TraceLauncher("Attempt to get JRE path from launcher executable path\n");
+
     if (GetApplicationHome(path, pathsize)) {
         /* Is JRE co-located with the application? */
         JLI_Snprintf(libjava, sizeof(libjava), "%s/lib/" JAVA_DLL, path);
         if (access(libjava, F_OK) == 0) {
             JLI_TraceLauncher("JRE path is %s\n", path);
             return JNI_TRUE;
         }
-        /* ensure storage for path + /jre + NULL */
-        if ((JLI_StrLen(path) + 4  + 1) > (size_t) pathsize) {
-            JLI_TraceLauncher("Insufficient space to store JRE path\n");
-            return JNI_FALSE;
-        }
-        /* Does the app ship a private JRE in <apphome>/jre directory? */
-        JLI_Snprintf(libjava, sizeof(libjava), "%s/jre/lib/" JAVA_DLL, path);
-        if (access(libjava, F_OK) == 0) {
-            JLI_StrCat(path, "/jre");
-            JLI_TraceLauncher("JRE path is %s\n", path);
-            return JNI_TRUE;
-        }
     }
 
+    JLI_TraceLauncher("Attempt to get JRE path from shared lib of the image\n");
+
     if (GetApplicationHomeFromDll(path, pathsize)) {
         JLI_Snprintf(libjava, sizeof(libjava), "%s/lib/" JAVA_DLL, path);
         if (stat(libjava, &s) == 0) {

src/java.base/windows/native/libjli/java_md.c

@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 1997, 2022, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 1997, 2024, 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
@@ -49,10 +49,6 @@ static jboolean GetJVMPath(const char *jrepath, const char *jvmtype,
                            char *jvmpath, jint jvmpathsize);
 static jboolean GetJREPath(char *path, jint pathsize);
 
-#ifdef USE_REGISTRY_LOOKUP
-jboolean GetPublicJREHome(char *buf, jint bufsize);
-#endif
-
 /* We supports warmup for UI stack that is performed in parallel
  * to VM initialization.
  * This helps to improve startup of UI application as warmup phase
@@ -300,27 +296,19 @@ GetJREPath(char *path, jint pathsize)
     char javadll[MAXPATHLEN];
     struct stat s;
 
+    JLI_TraceLauncher("Attempt to get JRE path from launcher executable path\n");
+
     if (GetApplicationHome(path, pathsize)) {
         /* Is JRE co-located with the application? */
         JLI_Snprintf(javadll, sizeof(javadll), "%s\\bin\\" JAVA_DLL, path);
         if (stat(javadll, &s) == 0) {
             JLI_TraceLauncher("JRE path is %s\n", path);
             return JNI_TRUE;
         }
-        /* ensure storage for path + \jre + NULL */
-        if ((JLI_StrLen(path) + 4 + 1) > (size_t) pathsize) {
-            JLI_TraceLauncher("Insufficient space to store JRE path\n");
-            return JNI_FALSE;
-        }
-        /* Does this app ship a private JRE in <apphome>\jre directory? */
-        JLI_Snprintf(javadll, sizeof (javadll), "%s\\jre\\bin\\" JAVA_DLL, path);
-        if (stat(javadll, &s) == 0) {
-            JLI_StrCat(path, "\\jre");
-            JLI_TraceLauncher("JRE path is %s\n", path);
-            return JNI_TRUE;
-        }
     }
 
+    JLI_TraceLauncher("Attempt to get JRE path from shared lib of the image\n");
+
     /* Try getting path to JRE from path to JLI.DLL */
     if (GetApplicationHomeFromDll(path, pathsize)) {
         JLI_Snprintf(javadll, sizeof(javadll), "%s\\bin\\" JAVA_DLL, path);
@@ -330,14 +318,6 @@ GetJREPath(char *path, jint pathsize)
         }
     }
 
-#ifdef USE_REGISTRY_LOOKUP
-    /* Lookup public JRE using Windows registry. */
-    if (GetPublicJREHome(path, pathsize)) {
-        JLI_TraceLauncher("JRE path is %s\n", path);
-        return JNI_TRUE;
-    }
-#endif
-
     JLI_ReportErrorMessage(JRE_ERROR8 JAVA_DLL);
     return JNI_FALSE;
 }