SQL/MX Guide to Stored Procedures in Java (G06.24+, H06.03+)

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Introduction

HP NonStop SQL/MX Guide to Stored Procedures in Java—523727-004

1-16

Class Loaders in an SPJ Environment

directory or JAR file specified by that external path and for loading all application

classes that are used by those SPJ classes. The SPJ class loader, instead of the

system class loader, loads application classes from directories and JAR files specified

in the class path.

In Figure 1-6, an SPJ method named myMethod3() in the

/usr/myapps/myJar.jar external path accesses an application class named

other.class in the /usr/otherapps class path. The SPJ class loader for the

/usr/myapps/myJar.jar external path loads a copy of other.class in addition to

the class file containing the SPJ method myMethod3().

Figure 1-6. SPJ Class Loaders in an SQL/MX UDR Server Process

VST007.vsd

One SPJ class loader is created and

assigned for each distinct external path.

SPJA

EXTERNAL NAME:

'pkg1.subpkg1.myClass1.myMethod1()'

EXTERNAL PATH:

'/usr/myapps'

SPJB

EXTERNAL NAME:

'pkg2.subpkg2.myClass2.myMethod2()'

EXTERNAL PATH:

'/usr/myapps/myJar.jar'

SPJC

EXTERNAL NAME:

'pkg3.subpkg3.myClass3.myMethod3()'

EXTERNAL PATH:

'/usr/myapps/myJar.jar'

SQL/MX UDR Server Process

SPJ Environment

CALL...

SPJ Class Loader X

for External Path

'/usr/myapps'

SPJ Class Loader Y

for External Path

'/usr/myapps/myJar.jar'

CALL...

Loads...

Refers to...

Application Class

other.class in the

/usr/otherapps class path

Copy of

Application

Class

other.class