Ignore non-jar files in ServiceLoaderLite (KT-29513)

compiler/cli/src/org/jetbrains/kotlin/cli/jvm/plugins/ServiceLoaderLite.kt

@@ -71,7 +71,7 @@ object ServiceLoaderLite {
 
         return when {
             file.isDirectory -> findImplementationsInDirectory(classIdentifier, file)
-            file.isFile -> findImplementationsInJar(classIdentifier, file)
+            file.isFile && file.extension.toLowerCase() == "jar" -> findImplementationsInJar(classIdentifier, file)
             else -> emptySet()
         }
     }

compiler/tests/org/jetbrains/kotlin/cli/serviceLoaderLite/AbstractServiceLoaderLiteTest.kt

@@ -37,7 +37,7 @@ abstract class AbstractServiceLoaderLiteTest : TestCaseWithTmpdir() {
     }
 
     protected fun writeJar(fileName: String, vararg entries: Entry): File {
-        val file = File(tmpdir, fileName)
+        val file = File(tmpdir, "$fileName.jar")
         if (file.exists()) {
             throw IllegalStateException("File $fileName already exists")
         }

compiler/tests/org/jetbrains/kotlin/cli/serviceLoaderLite/ServiceLoaderLiteTest.kt

@@ -7,6 +7,7 @@ package org.jetbrains.kotlin.cli.serviceLoaderLite
 
 import org.jetbrains.kotlin.cli.jvm.plugins.ServiceLoaderLite
 import org.jetbrains.kotlin.cli.jvm.plugins.ServiceLoaderLite.ServiceLoadingException
+import java.io.File
 import javax.annotation.processing.Processor
 
 class ServiceLoaderLiteTest : AbstractServiceLoaderLiteTest() {
@@ -112,5 +113,11 @@ class ServiceLoaderLiteTest : AbstractServiceLoaderLiteTest() {
             assertTrue("test.Zoo" in impls)
         }
     }
+
+    fun testWrongJarName() {
+        val file = File(tmpdir, "foo.tar.gz")
+        file.writeText("foobar")
+        ServiceLoaderLite.findImplementations(Processor::class.java, listOf(file))
+    }
 }