CHE-901: use ConcurrentHashMap for projects in ProjectRegistry

Signed-off-by: Vitaly Parfonov <[email protected]>

wsagent/che-core-api-project/src/main/java/org/eclipse/che/api/project/server/ProjectRegistry.java

@@ -36,6 +36,7 @@
 import java.util.List;
 import java.util.Map;
 import java.util.Optional;
+import java.util.concurrent.ConcurrentHashMap;
 import java.util.stream.Collectors;
 
 /**
@@ -61,7 +62,7 @@ public ProjectRegistry(WorkspaceHolder workspaceHolder,
                            VirtualFileSystemProvider vfsProvider,
                            ProjectTypeRegistry projectTypeRegistry,
                            ProjectHandlerRegistry handlers) throws ServerException {
-        this.projects = new HashMap<>();
+        this.projects = new ConcurrentHashMap<>();
         this.workspaceHolder = workspaceHolder;
         this.vfs = vfsProvider.getVirtualFileSystem();
         this.projectTypeRegistry = projectTypeRegistry;