On 16/05/2020 17:53, Alex Sviridov wrote:
:
When H2 is on classpath I don't have any problems - trigger is compiled. However, when H2 is on
module path (H2 has in manifest Automatic-Module-Name: com.h2database) on some
of child layers
(not boot layer) I get the following `output`:
/org/h2/dynamic/trigger/SOME_TRIGGER.java:6: error: package org.h2.api does not exist
public static org.h2.api.Trigger create() {
^
1 error
As I understand the problem is with classloader and JavaCompiler. Could anyone say how it can be fixed?
You can't compile against modules in module layers. Instead you'll need
to specify the module path where the compiler can find the JAR file with
module com.h2database. This snippet might help:
Path src = ... // path to the source code for SOME_TRIGGER
Path dir = ... // directory that contains com.h2database
Path output = ... // output directory
JavaCompiler compiler = ToolProvider.getSystemJavaCompiler();
StandardJavaFileManager fm =
compiler.getStandardFileManager(null, null, null);
fm.setLocationFromPaths(StandardLocation.MODULE_PATH,
List.of(dir));
fm.setLocationFromPaths(StandardLocation.CLASS_OUTPUT,
List.of(output));
Iterable<? extends JavaFileObject> paths =
fm.getJavaFileObjects(src);
JavaCompiler.CompilationTask task = compiler.getTask(null, fm,
null, null, null, paths);
task.addModules(List.of("com.h2database"));
task.call();
The call to addModules is needed because SOME_TRIGGER isn't being
compiled as a module so there is nobody to require com.h2database.
-Alan
