--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/Plugin/JavaVirtualMachine.cpp	Thu Oct 19 08:49:07 2023 +0200
@@ -0,0 +1,79 @@
+/**
+ * SPDX-FileCopyrightText: 2023 Sebastien Jodogne, UCLouvain, Belgium
+ * SPDX-License-Identifier: GPL-3.0-or-later
+ */
+
+/**
+ * Java plugin for Orthanc
+ * Copyright (C) 2023 Sebastien Jodogne, UCLouvain, Belgium
+ *
+ * This program is free software: you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation, either version 3 of the
+ * License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program. If not, see <http://www.gnu.org/licenses/>.
+ **/
+
+
+#include "JavaVirtualMachine.h"
+
+#include <cassert>
+#include <stdexcept>
+#include <vector>
+
+
+JavaVirtualMachine::JavaVirtualMachine(const std::string& classPath)
+{
+  std::string classPathOption = "-Djava.class.path=" + classPath;
+
+  std::vector<JavaVMOption> options;
+
+  options.resize(1);
+  options[0].optionString = const_cast<char*>(classPathOption.c_str());
+  options[0].extraInfo = NULL;
+
+#if !defined(NDEBUG)
+  // Debug mode
+  {
+    JavaVMOption option;
+    option.optionString = const_cast<char*>("-Xcheck:jni");
+    option.extraInfo = NULL;
+    options.push_back(option);
+  }
+#endif
+
+  JavaVMInitArgs vm_args;
+  vm_args.version  = JNI_VERSION_1_6;
+  vm_args.nOptions = options.size();
+  vm_args.options  = (options.empty() ? NULL : &options[0]);
+  vm_args.ignoreUnrecognized = false;
+
+  JNIEnv* env = NULL;
+  jint res = JNI_CreateJavaVM(&jvm_, (void **) &env, &vm_args);
+  if (res != JNI_OK ||
+      jvm_ == NULL ||
+      env == NULL)
+  {
+    throw std::runtime_error("Cannot create the JVM");
+  }
+}
+
+
+JavaVirtualMachine::~JavaVirtualMachine()
+{
+  jvm_->DestroyJavaVM();
+}
+
+
+JavaVM& JavaVirtualMachine::GetValue()
+{
+  assert(jvm_ != NULL);
+  return *jvm_;
+}