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A component supporting XWeak offers other objects to hold a reference on itself without preventing it from being destroyed when it is no longer needed. Thus, cyclic references can be avoided easily. The chapter Lifetime of UNO Objects discusses this in detail. In Java, derive from the Java helper class com.sun.star.lib.uno.helper.WeakBase to support XWeak. If a C++ component is derived from one of the ::cppu::Weak...ImplHelperNN template classes as proposed in the section C++ Component, a XWeak support is obtained, virtually for free. For the sake of completeness, this is the XWeak specification:

  // module com::sun::star::uno::XWeak
  interface XWeak: com::sun::star::uno::XInterface
      com::sun::star::uno::XAdapter queryAdapter(); 
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