How to load pre-transpiled PMML service provider JAR files?

[OOYXLOO]

How can I get an Evaluator from xxx.pmml.jar through the ServiceLoadingModelEvaluatorBuilder in a packaged jar?

I can't use this.getClass().getClassLoader().getResource("xxx.pmml.jar") to get the URL which is needed in SerciceLoadingModelEvaluatorBuilder.loadService to get an Evaluator because in a packaged jar I can't get the path.

I know that I can use LoadingModelEvaluatorBuilder to get an Evaluator from a xxx.pmml, but the unmarshal step will cost much time when I need to load abundant models.

I hope that someone can help me to solve this problem

[vruusmann]

How can I get an Evaluator from xxx.pmml.jar through the ServiceLoadingModelEvaluatorBuilder in a packaged jar?

The Java API can be derived from the class name: "serviceLoading" + "builder":

URL serviceJarURL = ...;

// First do "loadService", then do "build"
Evaluator evaluator = new ServiceLoadingModelEvaluatorBuilder()
	.loadService(serviceJarURL)
	.build();

I can't use this.getClass().getClassLoader().getResource("xxx.pmml.jar")

The ClassLoader#getResource(String) method is looking for a resource inside classpath JAR files.

Your xxx.pmml.jar service JAR file is not located inside any other JAR files, it is a standalone top-level JAR file all by itself (that's how it's supposed to work, if you have generated a "wrapped JAR file" already, then please unwrap it).

More importantly, the xxx.pmml.jar service JAR file does not need to be on your Java application's classpath. The Java classloader only knows about classpath contents so, by design, this xxx.pmml.jar service JAR file can/should be unknown to Java classloader initially.

I know that I can use LoadingModelEvaluatorBuilder to get an Evaluator from a xxx.pmm

The right question to ask is "how can I obtain a java.net.URL object pointing to my xxx.pmml.jar?"

Assuming a file in local filesystem:

File serviceJarFile = new File("/path/to/xxx.pmml.jar");

URL serviceJarURL = (serviceJarFile.toURI()).toURL();

Assuming a resource on some publicly accessible web seriver:

URL serviceJarURL = new URL("https://myserver.com/mydir/xxx.pmml.jar");

.. but the unmarshal step will cost much time when I need to load abundant models.

Yep, that's one valid reason for choosing JPMML-Transpiler over the standard JPMML-Evaluator - transpiled models do not have any Ja(va|karta) XML Binding dependencies, and they load blazing fast.

[OOYXLOO]

Thank you very much, I will solve the problem according to your suggestion.