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handles to vectors, memory leak caused by 
hard disks 
    cached filesystems 
    clustering files 
    disk I/O 
        striping 
    fragmentation 
    performance checklist 
    sweet spots, transferring data from 
hardware load balancing mechanisms 
hash partitioning 
hash tables 
    synchronized and unsynchronized 
hashCode( ) (Object)  2nd 
HashMap class  2nd  3rd 
    access and update times, comparing with TernarySearchTree 
    access, plain vs. cached 
    wrapped in WeakHashMap implementation 
HashSet class 
Hashtable class  2nd  3rd 
    access, plain vs. cached 
    specialized class for keys (example) 
    synchronization 
HashtableEntry class 
hasNext( ) (Iterator) 
Heap Analysis Tool (HAT) 
heap variables 
heap, tuning 
    benchmarking considerations 
    fine-tuning 
        disabling System.gc( ) calls 
        eliminating finalizers 
        expanding the heap 
        extreme heap and intimate shared memory 
        loading huge number of classes 
        minimizing pauses 
        per-thread stack size 
        RMI garbage collection 
    for EJB application server 
    gross tuning 
    measuring JVM heap size 
    monitoring size of 
    problems with larger heap 
    starting vs. maximum heap size 
hierarchical method invocation, overhead involved in 
horizontal scalability 
hostnames, DNS lookups of IP addresses 
hot replacement of failed components in EJB application server 
hot-deploy/undeploy applications for version management 
HotSpot 
    assert statements, stripping 
    garbage collection and 
    loops
        exception-terminated 
        unrolling 
    object pooling and 
    optimizations and 
    profiler 
    timings 
    VM optimizations in 
    VM startup times and 
HTTP servers, writing contents of multiple buffers in one I/O operation 
HttpServletResponse class 
HttpSession class 
    caching 
    invalidate( ) 
    optimizing use of 
    serialization 
    session data, storing in 
    setMaxinactiveInterval( ) 
    stateful session beans vs. 
HttpSessionBindingListener class 
HyperProf program