12.4 Compilation of Schema Objects

Loading a source file creates or updates a Java source schema object and invalidates the class schema objects previously derived from the source. If the class schema objects do not exist, then the loadjava tool creates them. The loadjava tool invalidates the old class schema objects because they were not compiled from the newly loaded source. Compilation of a newly loaded source, for example, class A, is automatically triggered by any of the following conditions:

• The resolver, while working on class B, finds that class B refers to class A, but class A is invalid.

• The compiler, while compiling the source of class B, finds that class B refers to class A, but class A is invalid.

• The class loader, while trying to load class A for running it, finds that class A is invalid.

To force compilation when you load a source file, use the loadjava -resolve option.

The compiler writes error messages to the predefined USER_ERRORS view. The loadjava tool retrieves and displays the messages produced by its compiler invocations.

The compiler recognizes some options. There are two ways to specify options to the compiler. If you run the loadjava tool with the -resolve option, then you can specify compiler options on the command line. You can additionally specify persistent compiler options in a per-schema database table, JAVA$OPTIONS. You can use the JAVA$OPTIONS table for default compiler options, which you can override selectively using a loadjava tool option.

Note:

A command-line option overrides and clears the matching entry in the JAVA$OPTIONS table.

A JAVA$OPTIONS row contains the names of source schema objects to which an option setting applies. You can use multiple rows to set the options differently for different source schema objects. The compiler looks up options in JAVA$OPTIONS when it has been called by the class loader or when called from the command line without specifying any options. When compiling a source schema object for which there is neither a JAVA$OPTIONS entry nor a command-line value for an option, the compiler assumes a default value, as follows:

• encoding = System.getProperty("file.encoding");

• online = true

  This applies only to Java sources that contain SQLJ constructs.

• debug = true

  This option is equivalent to javac -g.