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diff --git a/org.argeo.security.core/src/org/argeo/security/core/ThreadedLoginModule.java b/org.argeo.security.core/src/org/argeo/security/core/ThreadedLoginModule.java
new file mode 100644
index 000000000..8ddac8905
--- /dev/null
+++ b/org.argeo.security.core/src/org/argeo/security/core/ThreadedLoginModule.java
@@ -0,0 +1,50 @@
+package org.argeo.security.core;
+
+import java.util.Map;
+
+import javax.security.auth.Subject;
+import javax.security.auth.callback.CallbackHandler;
+import javax.security.auth.login.LoginException;
+import javax.security.auth.spi.LoginModule;
+
+/** Attach login modules to threads. */
+public abstract class ThreadedLoginModule implements LoginModule {
+	private ThreadLocal<LoginModule> loginModule = new ThreadLocal<LoginModule>() {
+
+		@Override
+		protected LoginModule initialValue() {
+			return createLoginModule();
+		}
+
+	};
+
+	protected abstract LoginModule createLoginModule();
+
+	@Override
+	public void initialize(Subject subject, CallbackHandler callbackHandler,
+			Map<String, ?> sharedState, Map<String, ?> options) {
+		loginModule.get().initialize(subject, callbackHandler, sharedState,
+				options);
+	}
+
+	@Override
+	public boolean login() throws LoginException {
+		return loginModule.get().login();
+	}
+
+	@Override
+	public boolean commit() throws LoginException {
+		return loginModule.get().commit();
+	}
+
+	@Override
+	public boolean abort() throws LoginException {
+		return loginModule.get().abort();
+	}
+
+	@Override
+	public boolean logout() throws LoginException {
+		return loginModule.get().logout();
+	}
+
+}