Memory usage: how do I free it?

I'm developing a C/S web application; I discovered that memory usage tends to be increasing, sometimes to the point that I had to restart the web server.
I added the line
System.gc();
but this did not seem to make any difference.
What should I do about it?

Is memory used by static variables and methods less likely to
be released than non-static variables and methods? Memory used by static variables is usually never released, but seldom uses more than a few kilobytes at max.
I have never heard that Objects referenced by static variables and methods are less likely to be released.
How do I make sure that object references are set to null, fischert?If they are stored in your own classes, just set them to 'null'. If the are stored in collections (maps, vectors, lists etc.) then there is a remove() method. In other cases there are native resources as MsTingle wrote. It depends on the situation.
Is there anything like "delete" in C++ that explicitly terminates
an object and frees memory used by it?No, this is not required.

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    snd_seq_device 4313 3 snd_seq_dummy,snd_seq_oss,snd_seq
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    snd_mixer_oss 14810 1 snd_pcm_oss
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    snd_timer 16117 2 snd_seq,snd_pcm
    sundance 15991 0
    uhci_hcd 19124 0
    snd 43847 9 snd_seq_oss,snd_intel8x0,snd_ac97_codec,snd_seq,snd_seq_device,snd_pcm_oss,snd_mixer_oss,snd_pcm,snd_timer
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    i2c_i801 7122 0
    soundcore 5007 1 snd
    iTCO_wdt 7577 0
    ehci_hcd 31594 0
    lp 6616 0
    sr_mod 13161 0
    analog 7939 0
    psmouse 56309 0
    ns558 1931 0
    parport_pc 27680 1
    shpchp 26592 0
    intel_agp 23225 1
    button 3638 0
    thermal 9326 0
    processor 26494 1
    snd_page_alloc 5809 2 snd_intel8x0,snd_pcm
    iTCO_vendor_support 1453 1 iTCO_wdt
    gameport 7130 3 analog,ns558
    parport 26575 3 ppdev,lp,parport_pc
    pcspkr 1347 0
    usbcore 118921 3 uhci_hcd,ehci_hcd
    serio_raw 3620 0
    evdev 6970 8
    i2c_core 15369 1 i2c_i801
    cdrom 31625 1 sr_mod
    pci_hotplug 23492 1 shpchp
    agpgart 23331 2 intel_agp
    sg 21079 0
    rtc_cmos 7504 0
    rtc_core 12011 1 rtc_cmos
    rtc_lib 1450 1 rtc_core
    ext2 56463 1
    mbcache 4278 1 ext2
    sd_mod 24101 3
    pata_acpi 2264 0
    ata_generic 2235 0
    ata_piix 17725 2
    libata 135579 3 pata_acpi,ata_generic,ata_piix
    floppy 47412 0
    scsi_mod 78933 4 sr_mod,sg,sd_mod,libata
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