Fix NPE from JarURLConnection.getUseCaches when loading compiler plugins

#KT-22513 Fixed

compiler/cli/src/org/jetbrains/kotlin/cli/common/CLITool.kt

@@ -29,6 +29,8 @@ import org.jetbrains.kotlin.cli.jvm.compiler.CompileEnvironmentException
 import org.jetbrains.kotlin.config.KotlinCompilerVersion
 import org.jetbrains.kotlin.config.Services
 import java.io.PrintStream
+import java.net.URL
+import java.net.URLConnection
 import java.util.function.Predicate
 
 abstract class CLITool<A : CommonToolArguments> {
@@ -79,6 +81,8 @@ abstract class CLITool<A : CommonToolArguments> {
     }
 
     fun exec(messageCollector: MessageCollector, services: Services, arguments: A): ExitCode {
+        disableURLConnectionCaches()
+
         printVersionIfNeeded(messageCollector, arguments)
 
         val fixedMessageCollector = if (arguments.suppressWarnings && !arguments.allWarningsAsErrors) {
@@ -92,6 +96,16 @@ abstract class CLITool<A : CommonToolArguments> {
         return execImpl(fixedMessageCollector, services, arguments)
     }
 
+    private fun disableURLConnectionCaches() {
+        // We disable caches to avoid problems with compiler under daemon, see https://youtrack.jetbrains.com/issue/KT-22513
+        // For some inexplicable reason, URLConnection.setDefaultUseCaches is an instance method modifying a static field,
+        // so we have to create a dummy instance to call that method
+
+        object : URLConnection(URL("file:.")) {
+            override fun connect() = throw UnsupportedOperationException()
+        }.defaultUseCaches = false
+    }
+
     // Used in kotlin-maven-plugin (KotlinCompileMojoBase)
     protected abstract fun execImpl(messageCollector: MessageCollector, services: Services, arguments: A): ExitCode