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diff --git a/jvmaccess/source/virtualmachine.cxx b/jvmaccess/source/virtualmachine.cxx
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+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+/*
+ * This file is part of the LibreOffice project.
+ *
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * This file incorporates work covered by the following license notice:
+ *
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements. See the NOTICE file distributed
+ * with this work for additional information regarding copyright
+ * ownership. The ASF licenses this file to you under the Apache
+ * License, Version 2.0 (the "License"); you may not use this file
+ * except in compliance with the License. You may obtain a copy of
+ * the License at http://www.apache.org/licenses/LICENSE-2.0 .
+ */
+
+#include <sal/config.h>
+
+#include <cassert>
+
+#include <jvmaccess/virtualmachine.hxx>
+#include <sal/log.hxx>
+
+using jvmaccess::VirtualMachine;
+
+VirtualMachine::AttachGuard::CreationException::CreationException()
+{}
+
+VirtualMachine::AttachGuard::CreationException::CreationException(
+ CreationException const &)
+{}
+
+VirtualMachine::AttachGuard::CreationException::~CreationException()
+{}
+
+VirtualMachine::AttachGuard::CreationException &
+VirtualMachine::AttachGuard::CreationException::operator =(
+ CreationException const &)
+{
+ return *this;
+}
+
+VirtualMachine::AttachGuard::AttachGuard(
+ rtl::Reference< VirtualMachine > const & rMachine):
+ m_xMachine(rMachine)
+{
+ assert(m_xMachine.is());
+ m_pEnvironment = m_xMachine->attachThread(&m_bDetach);
+ if (m_pEnvironment == nullptr)
+ throw CreationException();
+}
+
+VirtualMachine::AttachGuard::~AttachGuard()
+{
+ if (m_bDetach)
+ m_xMachine->detachThread();
+}
+
+VirtualMachine::VirtualMachine(JavaVM * pVm, int nVersion, bool bDestroy,
+ JNIEnv const * pMainThreadEnv):
+ m_pVm(pVm), m_nVersion(nVersion), m_bDestroy(bDestroy)
+{
+ (void) pMainThreadEnv; // avoid warnings
+ assert(pVm != nullptr);
+ assert(nVersion >= JNI_VERSION_1_2);
+ assert(pMainThreadEnv);
+}
+
+VirtualMachine::~VirtualMachine()
+{
+ if (m_bDestroy)
+ {
+ // Do not destroy the VM. Under Java 1.3, the AWT event loop thread is
+ // not a daemon thread and is never terminated, so that calling
+ // DestroyJavaVM (waiting for all non-daemon threads to terminate) hangs
+ // forever.
+/*
+ jint n = m_pVm->DestroyJavaVM();
+ SAL_WARN_IF(n != JNI_OK, "jvmaccess", "JNI: DestroyJavaVM failed");
+*/
+ }
+}
+
+JNIEnv * VirtualMachine::attachThread(bool * pAttached) const
+{
+ assert(pAttached != nullptr && "bad parameter");
+ JNIEnv * pEnv;
+ jint n = m_pVm->GetEnv(reinterpret_cast< void ** >(&pEnv), m_nVersion);
+ SAL_WARN_IF(
+ n != JNI_OK && n != JNI_EDETACHED, "jvmaccess", "JNI: GetEnv failed");
+ if (pEnv == nullptr)
+ {
+ if (m_pVm->AttachCurrentThread
+ (
+#ifndef ANDROID
+ reinterpret_cast< void ** >(&pEnv),
+#else
+ // The Android <jni.h> has AttachCurrentThread() taking a
+ // JNIEnv** and not void **
+ &pEnv,
+#endif
+ nullptr)
+ != JNI_OK)
+ return nullptr;
+ *pAttached = true;
+ }
+ else
+ *pAttached = false;
+ return pEnv;
+}
+
+void VirtualMachine::detachThread() const
+{
+ jint n = m_pVm->DetachCurrentThread();
+ SAL_WARN_IF(n != JNI_OK, "jvmaccess", "JNI: DetachCurrentThread failed");
+}
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */