JDK-4947890 : Minimize JNI upcalls in system-properties initialization
  • Type: Enhancement
  • Component: core-libs
  • Sub-Component: java.lang
  • Affected Version: 5.0
  • Priority: P3
  • Status: Resolved
  • Resolution: Fixed
  • OS: generic
  • CPU: generic
  • Submitted: 2003-11-03
  • Updated: 2025-04-03
  • Resolved: 2018-11-28
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JDK 12
12 b23Fixed
Related Reports
CSR :  
JDK-8213895 - Modify JVM interface functions for property initialization
Relates :  
JDK-8185496 - Improve performance of system properties initialization in initPhase1
Relates :  
JDK-8214794 - java.specification.version should be only the major version number
Relates :  
JDK-8275145 - file.encoding system property has an incorrect value on Windows
Relates :  
JDK-8214134 - Default for java.vendor.url
Relates :  
JDK-8242154 - Backport parts of JDK-4947890 to OpenJDK 11u
Relates :  
JDK-8352917 - Incorrect native.encoding on Windows
Relates :  
JDK-8241947 - Minor comment fixes for system property handling
Relates :  
JDK-8231769 - Test tools/javac/tree/MakeTypeTest.java fails with -Xcheck:jni
Description
The code that initializes system properties, which is partly in the libraries
(src/share/native/java/lang/System.c and the various java_props*.[ch] files)
and partly in HotSpot, does (almost) one JNI upcall for each system property
defined.  Since JNI upcalls are relatively expensive we should explore ways of
reorganizing the code in order to reduce them.  The native code could, e.g.,
pass a single big byte array up to the Java level, which could then decode that
array in one operation.

-- ###@###.### 2003/11/3
Comments
URL: http://hg.openjdk.java.net/jdk/jdk/rev/0bdbf854472f User: rriggs Date: 2018-11-28 21:00:44 +0000
28-11-2018
JDK-8185496 is retarget not to change the native implementation. So keep this issue open.
14-10-2017
Minimizing JNI upcalls to Properties::put, Properties::get and other methods will be covered by JDK-8185496 to improve the startup performance of system properties initialization.
26-09-2017