Switch plugin and annotation processor loading to the own implementation of ServiceLoader

'ServiceLoader' in JDK8 leaks file handles (https://bugs.openjdk.java.net/browse/JDK-8156014).
New implementation uses the ZipFile API, it also doesn't operate on the whole classpath which is not often needed.

plugins/kapt3/kapt3-base/src/org/jetbrains/kotlin/kapt3/base/ProcessorLoader.kt

@@ -14,7 +14,7 @@ import java.net.URLClassLoader
 import java.util.*
 import javax.annotation.processing.Processor
 
-class ProcessorLoader(
+open class ProcessorLoader(
     private val paths: KaptPaths,
     private val annotationProcessorFqNames: List<String>,
     private val logger: KaptLogger
@@ -33,7 +33,7 @@ class ProcessorLoader(
             annotationProcessorFqNames.mapNotNull { tryLoadProcessor(it, classLoader) }
         } else {
             logger.info("Need to discovery annotation processors in the AP classpath")
-            ServiceLoader.load(Processor::class.java, classLoader).toList()
+            doLoadProcessors(classLoader)
         }
 
         if (processors.isEmpty()) {
@@ -45,6 +45,10 @@ class ProcessorLoader(
         return processors
     }
 
+    open fun doLoadProcessors(classLoader: URLClassLoader): List<Processor> {
+        return ServiceLoader.load(Processor::class.java, classLoader).toList()
+    }
+
     private fun tryLoadProcessor(fqName: String, classLoader: ClassLoader): Processor? {
         val annotationProcessorClass = try {
             Class.forName(fqName, true, classLoader)

plugins/kapt3/kapt3-compiler/src/org/jetbrains/kotlin/kapt3/Kapt3Extension.kt

@@ -28,6 +28,7 @@ import org.jetbrains.kotlin.cli.common.messages.CompilerMessageSeverity.OUTPUT
 import org.jetbrains.kotlin.cli.common.messages.MessageCollector
 import org.jetbrains.kotlin.cli.common.messages.OutputMessageUtil
 import org.jetbrains.kotlin.cli.common.output.writeAll
+import org.jetbrains.kotlin.cli.jvm.plugins.ServiceLoaderLite
 import org.jetbrains.kotlin.codegen.ClassBuilderMode
 import org.jetbrains.kotlin.codegen.CompilationErrorHandler
 import org.jetbrains.kotlin.codegen.KotlinCodegenFacade
@@ -60,6 +61,7 @@ import org.jetbrains.kotlin.resolve.jvm.extensions.PartialAnalysisHandlerExtensi
 import java.io.File
 import java.io.StringWriter
 import java.io.Writer
+import java.net.URLClassLoader
 import javax.annotation.processing.Processor
 import com.sun.tools.javac.util.List as JavacList
 
@@ -87,7 +89,14 @@ class ClasspathBasedKapt3Extension(
     private var processorLoader: ProcessorLoader? = null
 
     override fun loadProcessors(): List<Processor> {
-        return ProcessorLoader(paths, annotationProcessorFqNames, logger).also { this.processorLoader = it }.loadProcessors()
+        val efficientProcessorLoader = object : ProcessorLoader(paths, annotationProcessorFqNames, logger) {
+            override fun doLoadProcessors(classLoader: URLClassLoader): List<Processor> {
+                return ServiceLoaderLite.loadImplementations(Processor::class.java, classLoader)
+            }
+        }
+
+        this.processorLoader = efficientProcessorLoader
+        return efficientProcessorLoader.loadProcessors()
     }
 
     override fun analysisCompleted(