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diff --git a/waflib/Tools/javaw.py b/waflib/Tools/javaw.py
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+#!/usr/bin/env python
+# encoding: utf-8
+# Thomas Nagy, 2006-2018 (ita)
+
+"""
+Java support
+
+Javac is one of the few compilers that behaves very badly:
+
+#. it outputs files where it wants to (-d is only for the package root)
+
+#. it recompiles files silently behind your back
+
+#. it outputs an undefined amount of files (inner classes)
+
+Remember that the compilation can be performed using Jython[1] rather than regular Python. Instead of
+running one of the following commands::
+
+   ./waf configure
+   python waf configure
+
+You would have to run::
+
+   java -jar /path/to/jython.jar waf configure
+
+[1] http://www.jython.org/
+"""
+
+import os, shutil
+from waflib import Task, Utils, Errors, Node
+from waflib.Configure import conf
+from waflib.TaskGen import feature, before_method, after_method
+
+from waflib.Tools import ccroot
+ccroot.USELIB_VARS['javac'] = set(['CLASSPATH', 'JAVACFLAGS'])
+
+SOURCE_RE = '**/*.java'
+JAR_RE = '**/*'
+
+class_check_source = '''
+public class Test {
+	public static void main(String[] argv) {
+		Class lib;
+		if (argv.length < 1) {
+			System.err.println("Missing argument");
+			System.exit(77);
+		}
+		try {
+			lib = Class.forName(argv[0]);
+		} catch (ClassNotFoundException e) {
+			System.err.println("ClassNotFoundException");
+			System.exit(1);
+		}
+		lib = null;
+		System.exit(0);
+	}
+}
+'''
+
+@feature('javac')
+@before_method('process_source')
+def apply_java(self):
+	"""
+	Create a javac task for compiling *.java files*. There can be
+	only one javac task by task generator.
+	"""
+	Utils.def_attrs(self, jarname='', classpath='',
+		sourcepath='.', srcdir='.',
+		jar_mf_attributes={}, jar_mf_classpath=[])
+
+	outdir = getattr(self, 'outdir', None)
+	if outdir:
+		if not isinstance(outdir, Node.Node):
+			outdir = self.path.get_bld().make_node(self.outdir)
+	else:
+		outdir = self.path.get_bld()
+	outdir.mkdir()
+	self.outdir = outdir
+	self.env.OUTDIR = outdir.abspath()
+
+	self.javac_task = tsk = self.create_task('javac')
+	tmp = []
+
+	srcdir = getattr(self, 'srcdir', '')
+	if isinstance(srcdir, Node.Node):
+		srcdir = [srcdir]
+	for x in Utils.to_list(srcdir):
+		if isinstance(x, Node.Node):
+			y = x
+		else:
+			y = self.path.find_dir(x)
+			if not y:
+				self.bld.fatal('Could not find the folder %s from %s' % (x, self.path))
+		tmp.append(y)
+
+	tsk.srcdir = tmp
+
+	if getattr(self, 'compat', None):
+		tsk.env.append_value('JAVACFLAGS', ['-source', str(self.compat)])
+
+	if hasattr(self, 'sourcepath'):
+		fold = [isinstance(x, Node.Node) and x or self.path.find_dir(x) for x in self.to_list(self.sourcepath)]
+		names = os.pathsep.join([x.srcpath() for x in fold])
+	else:
+		names = [x.srcpath() for x in tsk.srcdir]
+
+	if names:
+		tsk.env.append_value('JAVACFLAGS', ['-sourcepath', names])
+
+@feature('javac')
+@before_method('propagate_uselib_vars')
+@after_method('apply_java')
+def use_javac_files(self):
+	"""
+	Processes the *use* attribute referring to other java compilations
+	"""
+	lst = []
+	self.uselib = self.to_list(getattr(self, 'uselib', []))
+	names = self.to_list(getattr(self, 'use', []))
+	get = self.bld.get_tgen_by_name
+	for x in names:
+		try:
+			y = get(x)
+		except Errors.WafError:
+			self.uselib.append(x)
+		else:
+			y.post()
+			if hasattr(y, 'jar_task'):
+				lst.append(y.jar_task.outputs[0].abspath())
+				self.javac_task.set_run_after(y.jar_task)
+			else:
+				for tsk in y.tasks:
+					self.javac_task.set_run_after(tsk)
+	self.env.append_value('CLASSPATH', lst)
+
+@feature('javac')
+@after_method('apply_java', 'propagate_uselib_vars', 'use_javac_files')
+def set_classpath(self):
+	"""
+	Sets the CLASSPATH value on the *javac* task previously created.
+	"""
+	if getattr(self, 'classpath', None):
+		self.env.append_unique('CLASSPATH', getattr(self, 'classpath', []))
+	for x in self.tasks:
+		x.env.CLASSPATH = os.pathsep.join(self.env.CLASSPATH) + os.pathsep
+
+@feature('jar')
+@after_method('apply_java', 'use_javac_files')
+@before_method('process_source')
+def jar_files(self):
+	"""
+	Creates a jar task (one maximum per task generator)
+	"""
+	destfile = getattr(self, 'destfile', 'test.jar')
+	jaropts = getattr(self, 'jaropts', [])
+	manifest = getattr(self, 'manifest', None)
+
+	basedir = getattr(self, 'basedir', None)
+	if basedir:
+		if not isinstance(self.basedir, Node.Node):
+			basedir = self.path.get_bld().make_node(basedir)
+	else:
+		basedir = self.path.get_bld()
+	if not basedir:
+		self.bld.fatal('Could not find the basedir %r for %r' % (self.basedir, self))
+
+	self.jar_task = tsk = self.create_task('jar_create')
+	if manifest:
+		jarcreate = getattr(self, 'jarcreate', 'cfm')
+		if not isinstance(manifest,Node.Node):
+			node = self.path.find_resource(manifest)
+		else:
+			node = manifest
+		if not node:
+			self.bld.fatal('invalid manifest file %r for %r' % (manifest, self))
+		tsk.dep_nodes.append(node)
+		jaropts.insert(0, node.abspath())
+	else:
+		jarcreate = getattr(self, 'jarcreate', 'cf')
+	if not isinstance(destfile, Node.Node):
+		destfile = self.path.find_or_declare(destfile)
+	if not destfile:
+		self.bld.fatal('invalid destfile %r for %r' % (destfile, self))
+	tsk.set_outputs(destfile)
+	tsk.basedir = basedir
+
+	jaropts.append('-C')
+	jaropts.append(basedir.bldpath())
+	jaropts.append('.')
+
+	tsk.env.JAROPTS = jaropts
+	tsk.env.JARCREATE = jarcreate
+
+	if getattr(self, 'javac_task', None):
+		tsk.set_run_after(self.javac_task)
+
+@feature('jar')
+@after_method('jar_files')
+def use_jar_files(self):
+	"""
+	Processes the *use* attribute to set the build order on the
+	tasks created by another task generator.
+	"""
+	self.uselib = self.to_list(getattr(self, 'uselib', []))
+	names = self.to_list(getattr(self, 'use', []))
+	get = self.bld.get_tgen_by_name
+	for x in names:
+		try:
+			y = get(x)
+		except Errors.WafError:
+			self.uselib.append(x)
+		else:
+			y.post()
+			self.jar_task.run_after.update(y.tasks)
+
+class JTask(Task.Task):
+	"""
+	Base class for java and jar tasks; provides functionality to run long commands
+	"""
+	def split_argfile(self, cmd):
+		inline = [cmd[0]]
+		infile = []
+		for x in cmd[1:]:
+			# jar and javac do not want -J flags in @file
+			if x.startswith('-J'):
+				inline.append(x)
+			else:
+				infile.append(self.quote_flag(x))
+		return (inline, infile)
+
+class jar_create(JTask):
+	"""
+	Creates a jar file
+	"""
+	color   = 'GREEN'
+	run_str = '${JAR} ${JARCREATE} ${TGT} ${JAROPTS}'
+
+	def runnable_status(self):
+		"""
+		Wait for dependent tasks to be executed, then read the
+		files to update the list of inputs.
+		"""
+		for t in self.run_after:
+			if not t.hasrun:
+				return Task.ASK_LATER
+		if not self.inputs:
+			try:
+				self.inputs = [x for x in self.basedir.ant_glob(JAR_RE, remove=False) if id(x) != id(self.outputs[0])]
+			except Exception:
+				raise Errors.WafError('Could not find the basedir %r for %r' % (self.basedir, self))
+		return super(jar_create, self).runnable_status()
+
+class javac(JTask):
+	"""
+	Compiles java files
+	"""
+	color   = 'BLUE'
+	run_str = '${JAVAC} -classpath ${CLASSPATH} -d ${OUTDIR} ${JAVACFLAGS} ${SRC}'
+	vars = ['CLASSPATH', 'JAVACFLAGS', 'JAVAC', 'OUTDIR']
+	"""
+	The javac task will be executed again if the variables CLASSPATH, JAVACFLAGS, JAVAC or OUTDIR change.
+	"""
+	def uid(self):
+		"""Identify java tasks by input&output folder"""
+		lst = [self.__class__.__name__, self.generator.outdir.abspath()]
+		for x in self.srcdir:
+			lst.append(x.abspath())
+		return Utils.h_list(lst)
+
+	def runnable_status(self):
+		"""
+		Waits for dependent tasks to be complete, then read the file system to find the input nodes.
+		"""
+		for t in self.run_after:
+			if not t.hasrun:
+				return Task.ASK_LATER
+
+		if not self.inputs:
+			self.inputs  = []
+			for x in self.srcdir:
+				if x.exists():
+					self.inputs.extend(x.ant_glob(SOURCE_RE, remove=False))
+		return super(javac, self).runnable_status()
+
+	def post_run(self):
+		"""
+		List class files created
+		"""
+		for node in self.generator.outdir.ant_glob('**/*.class'):
+			self.generator.bld.node_sigs[node] = self.uid()
+		self.generator.bld.task_sigs[self.uid()] = self.cache_sig
+
+@feature('javadoc')
+@after_method('process_rule')
+def create_javadoc(self):
+	"""
+	Creates a javadoc task (feature 'javadoc')
+	"""
+	tsk = self.create_task('javadoc')
+	tsk.classpath = getattr(self, 'classpath', [])
+	self.javadoc_package = Utils.to_list(self.javadoc_package)
+	if not isinstance(self.javadoc_output, Node.Node):
+		self.javadoc_output = self.bld.path.find_or_declare(self.javadoc_output)
+
+class javadoc(Task.Task):
+	"""
+	Builds java documentation
+	"""
+	color = 'BLUE'
+
+	def __str__(self):
+		return '%s: %s -> %s\n' % (self.__class__.__name__, self.generator.srcdir, self.generator.javadoc_output)
+
+	def run(self):
+		env = self.env
+		bld = self.generator.bld
+		wd = bld.bldnode
+
+		#add src node + bld node (for generated java code)
+		srcpath = self.generator.path.abspath() + os.sep + self.generator.srcdir
+		srcpath += os.pathsep
+		srcpath += self.generator.path.get_bld().abspath() + os.sep + self.generator.srcdir
+
+		classpath = env.CLASSPATH
+		classpath += os.pathsep
+		classpath += os.pathsep.join(self.classpath)
+		classpath = "".join(classpath)
+
+		self.last_cmd = lst = []
+		lst.extend(Utils.to_list(env.JAVADOC))
+		lst.extend(['-d', self.generator.javadoc_output.abspath()])
+		lst.extend(['-sourcepath', srcpath])
+		lst.extend(['-classpath', classpath])
+		lst.extend(['-subpackages'])
+		lst.extend(self.generator.javadoc_package)
+		lst = [x for x in lst if x]
+
+		self.generator.bld.cmd_and_log(lst, cwd=wd, env=env.env or None, quiet=0)
+
+	def post_run(self):
+		nodes = self.generator.javadoc_output.ant_glob('**')
+		for node in nodes:
+			self.generator.bld.node_sigs[node] = self.uid()
+		self.generator.bld.task_sigs[self.uid()] = self.cache_sig
+
+def configure(self):
+	"""
+	Detects the javac, java and jar programs
+	"""
+	# If JAVA_PATH is set, we prepend it to the path list
+	java_path = self.environ['PATH'].split(os.pathsep)
+	v = self.env
+
+	if 'JAVA_HOME' in self.environ:
+		java_path = [os.path.join(self.environ['JAVA_HOME'], 'bin')] + java_path
+		self.env.JAVA_HOME = [self.environ['JAVA_HOME']]
+
+	for x in 'javac java jar javadoc'.split():
+		self.find_program(x, var=x.upper(), path_list=java_path)
+
+	if 'CLASSPATH' in self.environ:
+		v.CLASSPATH = self.environ['CLASSPATH']
+
+	if not v.JAR:
+		self.fatal('jar is required for making java packages')
+	if not v.JAVAC:
+		self.fatal('javac is required for compiling java classes')
+
+	v.JARCREATE = 'cf' # can use cvf
+	v.JAVACFLAGS = []
+
+@conf
+def check_java_class(self, classname, with_classpath=None):
+	"""
+	Checks if the specified java class exists
+
+	:param classname: class to check, like java.util.HashMap
+	:type classname: string
+	:param with_classpath: additional classpath to give
+	:type with_classpath: string
+	"""
+	javatestdir = '.waf-javatest'
+
+	classpath = javatestdir
+	if self.env.CLASSPATH:
+		classpath += os.pathsep + self.env.CLASSPATH
+	if isinstance(with_classpath, str):
+		classpath += os.pathsep + with_classpath
+
+	shutil.rmtree(javatestdir, True)
+	os.mkdir(javatestdir)
+
+	Utils.writef(os.path.join(javatestdir, 'Test.java'), class_check_source)
+
+	# Compile the source
+	self.exec_command(self.env.JAVAC + [os.path.join(javatestdir, 'Test.java')], shell=False)
+
+	# Try to run the app
+	cmd = self.env.JAVA + ['-cp', classpath, 'Test', classname]
+	self.to_log("%s\n" % str(cmd))
+	found = self.exec_command(cmd, shell=False)
+
+	self.msg('Checking for java class %s' % classname, not found)
+
+	shutil.rmtree(javatestdir, True)
+
+	return found
+
+@conf
+def check_jni_headers(conf):
+	"""
+	Checks for jni headers and libraries. On success the conf.env variables xxx_JAVA are added for use in C/C++ targets::
+
+		def options(opt):
+			opt.load('compiler_c')
+
+		def configure(conf):
+			conf.load('compiler_c java')
+			conf.check_jni_headers()
+
+		def build(bld):
+			bld.shlib(source='a.c', target='app', use='JAVA')
+	"""
+	if not conf.env.CC_NAME and not conf.env.CXX_NAME:
+		conf.fatal('load a compiler first (gcc, g++, ..)')
+
+	if not conf.env.JAVA_HOME:
+		conf.fatal('set JAVA_HOME in the system environment')
+
+	# jni requires the jvm
+	javaHome = conf.env.JAVA_HOME[0]
+
+	dir = conf.root.find_dir(conf.env.JAVA_HOME[0] + '/include')
+	if dir is None:
+		dir = conf.root.find_dir(conf.env.JAVA_HOME[0] + '/../Headers') # think different?!
+	if dir is None:
+		conf.fatal('JAVA_HOME does not seem to be set properly')
+
+	f = dir.ant_glob('**/(jni|jni_md).h')
+	incDirs = [x.parent.abspath() for x in f]
+
+	dir = conf.root.find_dir(conf.env.JAVA_HOME[0])
+	f = dir.ant_glob('**/*jvm.(so|dll|dylib)')
+	libDirs = [x.parent.abspath() for x in f] or [javaHome]
+
+	# On windows, we need both the .dll and .lib to link.  On my JDK, they are
+	# in different directories...
+	f = dir.ant_glob('**/*jvm.(lib)')
+	if f:
+		libDirs = [[x, y.parent.abspath()] for x in libDirs for y in f]
+
+	if conf.env.DEST_OS == 'freebsd':
+		conf.env.append_unique('LINKFLAGS_JAVA', '-pthread')
+	for d in libDirs:
+		try:
+			conf.check(header_name='jni.h', define_name='HAVE_JNI_H', lib='jvm',
+				libpath=d, includes=incDirs, uselib_store='JAVA', uselib='JAVA')
+		except Exception:
+			pass
+		else:
+			break
+	else:
+		conf.fatal('could not find lib jvm in %r (see config.log)' % libDirs)
+