榪欏潡鍐呭瓨涓昏鏄JVM瀛樻斁Class鍜孧eta淇℃伅鐨?Class鍦ㄨLoader鏃跺氨浼?xì)琚攽謭癙ermGen space涓?
瀹冨拰瀛樻斁綾誨疄渚?Instance)鐨凥eap鍖哄煙涓嶅悓,GC(Garbage Collection)涓嶄細(xì)鍦ㄤ富紼嬪簭榪愯鏈熷
PermGen space榪涜娓呯悊錛屾墍浠ュ鏋滀綘鐨勫簲鐢ㄤ腑鏈夊緢澶欳LASS鐨勮瘽,灝卞緢鍙兘鍑虹幇PermGen space閿欒,
榪欑閿欒甯歌鍦╳eb鏈嶅姟鍣ㄥJSP榪涜pre compile鐨勬椂鍊欍傚鏋滀綘鐨刉EB APP涓嬮兘鐢ㄤ簡澶ч噺鐨勭涓夋柟jar, 鍏跺ぇ灝?br /> 瓚呰繃浜唈vm榛樿鐨勫ぇ灝?4M)閭ｄ箞灝變細(xì)浜х敓姝ら敊璇俊鎭簡銆?br /> 瑙ｅ喅鏂規(guī)硶錛?鎵嬪姩璁劇疆MaxPermSize澶у皬
淇敼TOMCAT_HOME/bin/catalina.sh
鍦?#8220;echo "Using CATALINA_BASE: $CATALINA_BASE"”涓婇潰鍔犲叆浠ヤ笅琛岋細(xì)
JAVA_OPTS="-server -XX:PermSize=64M -XX:MaxPermSize=128m
寤鴻錛氬皢鐩稿悓鐨勭涓夋柟jar鏂囦歡縐葷疆鍒皌omcat/shared/lib鐩綍涓嬶紝榪欐牱鍙互杈懼埌鍑忓皯jar 鏂囨。閲嶅鍗犵敤鍐呭瓨鐨勭洰鐨勩?/span>
浜屻乯ava.lang.OutOfMemoryError: Java heap space
Heap size 璁劇疆
JVM鍫嗙殑璁劇疆鏄寚java紼嬪簭榪愯榪囩▼涓璊VM鍙互璋冮厤浣跨敤鐨勫唴瀛樼┖闂寸殑璁劇疆.JVM鍦ㄥ惎鍔ㄧ殑鏃跺欎細(xì)鑷姩璁劇疆Heap size鐨勫鹼紝
鍏跺垵濮嬬┖闂?鍗?Xms)鏄墿鐞嗗唴瀛樼殑1/64錛屾渶澶х┖闂?-Xmx)鏄墿鐞嗗唴瀛樼殑1/4銆傚彲浠ュ埄鐢↗VM鎻愪緵鐨?Xmn -Xms -Xmx絳夐夐」鍙?br />
榪涜璁劇疆銆侶eap size 鐨勫ぇ灝忔槸Young Generation 鍜孴enured Generaion 涔嬪拰銆?br />
鎻愮ず錛氬湪JVM涓鏋?8錛呯殑鏃墮棿鏄敤浜嶨C涓斿彲鐢ㄧ殑Heap size 涓嶈凍2錛呯殑鏃跺欏皢鎶涘嚭姝ゅ紓甯鎬俊鎭?br />
鎻愮ず錛欻eap Size 鏈澶т笉瑕佽秴榪囧彲鐢ㄧ墿鐞嗗唴瀛樼殑80錛咃紝涓鑸殑瑕佸皢-Xms鍜?Xmx閫夐」璁劇疆涓虹浉鍚岋紝鑰?Xmn涓?/4鐨?Xmx鍊箋?
瑙ｅ喅鏂規(guī)硶錛氭墜鍔ㄨ緗瓾eap size
淇敼TOMCAT_HOME/bin/catalina.sh
鍦?#8220;echo "Using CATALINA_BASE: $CATALINA_BASE"”涓婇潰鍔犲叆浠ヤ笅琛岋細(xì)
JAVA_OPTS="-server -Xms800m -Xmx800m -XX:MaxNewSize=256m"
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set _EXECJAVA=start "Tomcat" %_RUNJAVA%
鎶婂叾涓殑Tomcat鏀規(guī)垚浣犳兂瑕佺殑鍚嶅瓧鍗沖彲銆?/p>
濡?
set _EXECJAVA=start "MyWeb" %_RUNJAVA%
榪欐牱鍦ㄥ惎鍔═omcat鐨勬椂鍊欑獥鍙ｅ悕瀛楀嵆鏄疢yWeb銆傝繖鏍峰湪涓涓満鍣ㄤ笂鍚姩澶氫釜Tomcat鐨勬椂鍊欏彲浠ュ尯鍒嗗嚭鏉ャ?/p>
浠ヤ笅鏄緥瀛愶細(xì)
public class Test {
private String name;
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
}
public class Test1 {
private static Test staticTest;
public static void main(String[] args) {
Test t1 = new Test();
call(t1);
System.out.println(t1.getName());
}
public static void call(Test rt) {
staticTest = new Test();
staticTest.setName("abc");
rt.setName("cba");
rt = staticTest;
}
}
姝ゆ椂鐨勮繍琛岀粨鏋滄槸浠涔堬紵鏈哄櫒緇欏嚭鐨勭粨鏋滄槸“cba”錛屼負(fù)浠涔堜細(xì)榪欐牱錛屾垜鐞嗚В濡備笅錛?br /> rt.setName("cba");
姝ゆ椂rt鏄痶1鐨勪竴涓鍒訛紝浣嗘槸鍙堜笉浠ｈ〃t1,浣嗘槸rt鍜宼1閮芥寚鍚戝悓涓涓璞★紝鏃犺閫氳繃rt榪樻槸t1鏉ラ兘浼?xì)鏀瑰彉鎵寮曠敤瀵硅薄鐨勫箋?br /> rt = staticTest;
榪欐椂浼?xì)鎶妔taticTest鐨勫紩鐢ㄨ祴緇檙t錛屼絾鏄痳t鍙槸t1鐨勪竴涓紩鐢紝 rt姝ゆ椂鎸囧悜staticTest錛屼絾鏄笉浼?xì)鏇存敼t1鐨勫箋?br /> 鎵浠ヤ細(xì)鍙戠敓浠ヤ笂鐨勭粨鏋溿備笉鐭ラ亾姝ｇ‘涓庡惁錛?br />
]]>