Problem in installing pljava on windows

Question

Error on installing pl/java on windows 7 x64 and PostgreSQL 9.0.

CREATE FUNCTION sqlj.java_call_handler()
  RETURNS language_handler AS 'pljava'
  LANGUAGE C;

Error:

ERROR: could not load library "C:/Program Files/PostgreSQL/9.0/lib/pljava.dll": The specified module could not be found.

*** Error ***

ERROR: could not load library "C:/Program Files/PostgreSQL/9.0/lib/pljava.dll": The specified module could not be found. SQL state: 58P01

But I'm sure that pljava.dll exists in C:/Program Files/PostgreSQL/9.0/lib

Answer 1

I found it's possible to install PL/Java procedural language on PostgreSQL 9.0 64 bit on Windows 7 64 bit (I had same errore message as yours). I see (C:/Program Files path) that you have 64 bit version of PostgreSQL, so you need 64 bit JRE (assuming C:\Program Files\Java\jre6):

• Download PL/Java 64 bit binary package from pgFoundry (that is, pljava-x86_64-w64-mingw32-pg9.0-1.4.2.tar.gz)
• Unpack archive to C:\Program Files\PostgreSQL\9.0\share\pljava directory
• Put pljava.dll into C:\Program Files\PostgreSQL\9.0\lib directory
• Add into postgresql.conf (data):

custom_variable_classes = 'pljava'
pljava.classpath='C:\\Program Files\\PostgreSQL\\9.0\\share\\pljava\\pljava.jar'

• Add into PATH (My Computer → Properties → Advanced → Environment Variables):

;C:\Program Files\Java\jre6\bin;C:\Program Files\Java\jre6\bin\server

(you can create another JRE_HOME variable if you like and then write ;%JRE_HOME%\bin;%JRE_HOME%\bin\server)

After that restart PostgreSQL service (postgresql-x64-9.0) and load C:\Program Files\PostgreSQL\9.0\share\pljava\install.sql again. Check:

postgres=# SELECT lanname FROM pg_language;
 lanname
----------
 internal
 c
 sql
 plpgsql
 java
 javau
(6 rows)