diff --git a/src/icmtoolchain/builtin_tasks.py b/src/icmtoolchain/builtin_tasks.py
index eeb2866..8d6cf14 100644
--- a/src/icmtoolchain/builtin_tasks.py
+++ b/src/icmtoolchain/builtin_tasks.py
@@ -49,9 +49,7 @@ def task_compile_java(tool: Optional[str] = None) -> int:
 	from .java_build import compile_java
 	if not tool:
 		tool = GLOBALS.MAKE_CONFIG.get_value("java.compiler", "gradle")
-	if not tool:
-		return 1
-	if not tool == "gradle" and GLOBALS.MAKE_CONFIG.get_value("java.configurable", False):
+	if tool != "gradle" and GLOBALS.MAKE_CONFIG.get_value("java.configurable", False):
 		attention("Project uses configurable Gradle, different tools cannot be applied.")
 		tool = "gradle"
 	return compile_java(tool)
@@ -78,7 +76,6 @@ def task_compile_native() -> int:
 		if len(abis) == 0:
 			abis = GLOBALS.MAKE_CONFIG.obtain_list("abis")
 	if len(abis) == 0:
-		attention(f"No `abis` value in 'toolchain.json' config, using defaults otherwise.")
 		abis = ["arm64-v8a", "armeabi-v7a"]
 	from .native_build import compile_native, copy_shared_objects
 	result = compile_native(abis)
diff --git a/src/icmtoolchain/includes.py b/src/icmtoolchain/includes.py
index 7cebdce..b3dc714 100644
--- a/src/icmtoolchain/includes.py
+++ b/src/icmtoolchain/includes.py
@@ -39,7 +39,7 @@ class Includes:
 				self.decode_line(line.strip(), dependents)
 		for dependent in dependents:
 			if (dependent in GLOBALS.TSCONFIG_DEPENDENTS and GLOBALS.TSCONFIG_DEPENDENTS[dependent] in self.params and self.params[GLOBALS.TSCONFIG_DEPENDENTS[dependent]] == True):
-				self.params[GLOBALS.TSCONFIG_DEPENDENTS[dependent]] = not self.params[GLOBALS.TSCONFIG_DEPENDENTS[dependent]]
+				self.params[dependent] = not self.params[dependent]
 
 	def decode_param(self, key: str, value: Any, dependents: List[str]) -> None:
 		default = GLOBALS.TSCONFIG_TOOLCHAIN[key] if key in GLOBALS.TSCONFIG_TOOLCHAIN else TSCONFIG[key]
diff --git a/src/icmtoolchain/java_build.py b/src/icmtoolchain/java_build.py
index 6c701ff..4bf8b06 100644
--- a/src/icmtoolchain/java_build.py
+++ b/src/icmtoolchain/java_build.py
@@ -6,7 +6,7 @@ import subprocess
 from itertools import tee
 from os.path import basename, exists, isdir, isfile, join, relpath, splitext
 from typing import (Collection, Dict, Iterable, List, MutableSequence,
-                    NamedTuple)
+                    NamedTuple, Optional)
 from zipfile import ZipFile
 
 from .config import Config
@@ -620,7 +620,7 @@ def build_java_directories(tool: str, directories: Iterable[MakeJavaData], targe
 	GLOBALS.BUILD_STORAGE.save()
 	return result
 
-def compile_java(tool: str = "gradle") -> int:
+def compile_java(tool: Optional[str] = "gradle") -> int:
 	if tool not in ("gradle", "javac", "ecj"):
 		failure(f"Java compilation will be cancelled, because tool {tool!r} is not available.")
 		return 255