Play OpenJDK: 鍏佽浣犵殑鍖呭悕浠?java."寮澶?/span>
鏈枃鏄疨lay OpenJDK鐨勭浜岀瘒錛屼粙緇嶄簡濡備綍紿佺牬JDK涓嶅厑璁歌嚜瀹氫箟鐨勫寘鍚嶄互"java."寮澶磋繖涓闄愬埗銆傝繖涓鎶宸у浜庡熀浜庡凡鏈夌殑JDK鍚慾ava.*涓坊鍔犳柊綾昏繕鏄湁鎵甯姪鐨勩?2015.11.02鏈鍚庢洿鏂?
鏃犺鏄粡楠屼赴瀵岀殑Java紼嬪簭鍛橈紝榪樻槸Java鐨勫垵瀛﹁咃紝鎬諱細(xì)鏈変竴浜涗漢鎴栨湁鎰忔垨鏃犳剰鍦板垱寤轟竴涓寘鍚嶄負(fù)"java"鐨勭被銆備絾鍑轟簬瀹夊叏鏂歸潰鐨勮冭檻錛孞DK涓嶅厑璁稿簲鐢ㄧ▼搴忕被鐨勫寘鍚嶄互"java"寮澶達(dá)紝鍗充笉鍏佽java錛宩ava.foo榪欐牱鐨勫寘鍚嶃備絾javax錛宩avaex榪欐牱鐨勫寘鍚嶆槸鍏佽鐨勩?br />
1. 渚嬪瓙
姣斿錛屼互OpenJDK 8涓哄熀紜錛岃噯閫犺繖鏍蜂竴涓緥瀛愩傜瑪鑰呮兂鍚慜penJDK璐＄尞涓涓悓姝ョ殑HashMap錛屽嵆綾籗ynchronizedHashMap錛岃岃綾葷殑鍖呭悕灝變負(fù)java.util銆係ynchronizedHashMap鏄疕ashMap鐨勫悓姝ヤ唬鐞嗭紝鐢變簬榪欎袱涓被鏄湪鍚屼竴鍖呭唴錛孲ynchronizedHashMap涓嶄粎鍙互璁塊棶HashMap鐨刾ublic鏂規(guī)硶涓庡彉閲忥紝榪樺彲浠ヨ闂瓾ashMap鐨刾rotected鍜宒efault鏂規(guī)硶涓庡彉閲忋係ynchronizedHashMap鐪嬭搗鏉ュ彲鑳藉儚涓嬮潰榪欐牱錛?br />
package java.util;
public class SynchronizedHashMap<K, V> {
private HashMap<K, V> hashMap = null;
public SynchronizedHashMap(HashMap<K, V> hashMap) {
this.hashMap = hashMap;
}
public SynchronizedHashMap() {
this(new HashMap<>());
}
public synchronized V put(K key, V value) {
return hashMap.put(key, value);
}
public synchronized V get(K key) {
return hashMap.get(key);
}
public synchronized V remove(K key) {
return hashMap.remove(key);
}
public synchronized int size() {
return hashMap.size; // 鐩存帴璋冪敤HashMap.size鍙橀噺錛岃岄潪HashMap.size()鏂規(guī)硶
}
}
public class SynchronizedHashMap<K, V> {
private HashMap<K, V> hashMap = null;
public SynchronizedHashMap(HashMap<K, V> hashMap) {
this.hashMap = hashMap;
}
public SynchronizedHashMap() {
this(new HashMap<>());
}
public synchronized V put(K key, V value) {
return hashMap.put(key, value);
}
public synchronized V get(K key) {
return hashMap.get(key);
}
public synchronized V remove(K key) {
return hashMap.remove(key);
}
public synchronized int size() {
return hashMap.size; // 鐩存帴璋冪敤HashMap.size鍙橀噺錛岃岄潪HashMap.size()鏂規(guī)硶
}
}
2. ClassLoader鐨勯檺鍒?/span>
浣跨敤javac鍘葷紪璇戞簮鏂囦歡SynchronizedHashMap.java騫舵病鏈夐棶棰橈紝浣嗗湪浣跨敤緙栬瘧鍚庣殑SynchronizedHashMap.class鏃訛紝JDK鐨凜lassLoader鍒欎細(xì)鎷掔粷鍔犺澆java.util.SynchronizedHashMap銆?br />璁炬兂鏈夊涓嬬殑搴旂敤紼嬪簭錛?br />
import java.util.SynchronizedHashMap;
public class SyncMapTest {
public static void main(String[] args) {
SynchronizedHashMap<String, String> syncMap = new SynchronizedHashMap<>();
syncMap.put("Key", "Value");
System.out.println(syncMap.get("Key"));
}
}
浣跨敤java鍛戒護(hù)鍘昏繍琛岃搴旂敤鏃訛紝浼?xì)鎶ュ涓嬮敊璇Q?br />public class SyncMapTest {
public static void main(String[] args) {
SynchronizedHashMap<String, String> syncMap = new SynchronizedHashMap<>();
syncMap.put("Key", "Value");
System.out.println(syncMap.get("Key"));
}
}
Exception in thread "main" java.lang.SecurityException: Prohibited package name: java.util
at java.lang.ClassLoader.preDefineClass(ClassLoader.java:659)
at java.lang.ClassLoader.defineClass(ClassLoader.java:758)
at java.security.SecureClassLoader.defineClass(SecureClassLoader.java:142)
at java.net.URLClassLoader.defineClass(URLClassLoader.java:467)
at java.net.URLClassLoader.access$100(URLClassLoader.java:73)
at java.net.URLClassLoader$1.run(URLClassLoader.java:368)
at java.net.URLClassLoader$1.run(URLClassLoader.java:362)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(URLClassLoader.java:361)
at java.lang.ClassLoader.loadClass(ClassLoader.java:424)
at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:331)
at java.lang.ClassLoader.loadClass(ClassLoader.java:357)
at SyncMapTest.main(SyncMapTest.java:6)
鏂規(guī)硶ClassLoader.preDefineClass()鐨勬簮浠ｇ爜濡備笅錛?br />at java.lang.ClassLoader.preDefineClass(ClassLoader.java:659)
at java.lang.ClassLoader.defineClass(ClassLoader.java:758)
at java.security.SecureClassLoader.defineClass(SecureClassLoader.java:142)
at java.net.URLClassLoader.defineClass(URLClassLoader.java:467)
at java.net.URLClassLoader.access$100(URLClassLoader.java:73)
at java.net.URLClassLoader$1.run(URLClassLoader.java:368)
at java.net.URLClassLoader$1.run(URLClassLoader.java:362)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(URLClassLoader.java:361)
at java.lang.ClassLoader.loadClass(ClassLoader.java:424)
at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:331)
at java.lang.ClassLoader.loadClass(ClassLoader.java:357)
at SyncMapTest.main(SyncMapTest.java:6)
private ProtectionDomain preDefineClass(String name,
ProtectionDomain pd)
{
if (!checkName(name))
throw new NoClassDefFoundError("IllegalName: " + name);
if ((name != null) && name.startsWith("java.")) {
throw new SecurityException
("Prohibited package name: " +
name.substring(0, name.lastIndexOf('.')));
}
if (pd == null) {
pd = defaultDomain;
}
if (name != null) checkCerts(name, pd.getCodeSource());
return pd;
}
寰堟竻妤氬湴錛岃鏂規(guī)硶浼?xì)鍏垕個(gè)鏌ュ緟鍔犺澆鐨勭被鍏ㄥ悕(鍗沖寘鍚?綾誨悕)鏄惁浠?java."寮澶達(dá)紝濡傛槸錛屽垯鎶涘嚭SecurityException銆傞偅涔堝彲浠ュ皾璇曚慨鏀硅鏂規(guī)硶鐨勬簮浠ｇ爜錛屼互紿佺牬榪欎竴闄愬埗銆?br />浠嶫DK涓殑src.zip涓嬁鍑簀ava/lang/ClassLoader.java鏂囦歡錛屼慨鏀瑰叾涓殑preDefineClass鏂規(guī)硶浠ュ幓闄ょ浉鍏抽檺鍒躲傞噸鏂扮紪璇慍lassLoader.java錛屽皢鐢熸垚鐨凜lassLoader.class錛孋lassLoader$1.class錛孋lassLoader$2.class錛孋lassLoader$3.class錛孋lassLoader$NativeLibrary.class錛孋lassLoader$ParallelLoaders.class鍜孲ystemClassLoaderAction.class鍘繪浛鎹DK/jre/lib/rt.jar涓搴旂殑綾匯?br />鍐嶆榪愯SyncMapTest錛屽嵈浠嶇劧浼?xì)鎶涘嚭鐩稿悓鐨凷ecurityException錛屽涓嬫墍紺猴細(xì)ProtectionDomain pd)
{
if (!checkName(name))
throw new NoClassDefFoundError("IllegalName: " + name);
if ((name != null) && name.startsWith("java.")) {
throw new SecurityException
("Prohibited package name: " +
name.substring(0, name.lastIndexOf('.')));
}
if (pd == null) {
pd = defaultDomain;
}
if (name != null) checkCerts(name, pd.getCodeSource());
return pd;
}
Exception in thread "main" java.lang.SecurityException: Prohibited package name: java.util
at java.lang.ClassLoader.defineClass1(Native Method)
at java.lang.ClassLoader.defineClass(ClassLoader.java:760)
at java.security.SecureClassLoader.defineClass(SecureClassLoader.java:142)
at java.net.URLClassLoader.defineClass(URLClassLoader.java:467)
at java.net.URLClassLoader.access$100(URLClassLoader.java:73)
at java.net.URLClassLoader$1.run(URLClassLoader.java:368)
at java.net.URLClassLoader$1.run(URLClassLoader.java:362)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(URLClassLoader.java:361)
at java.lang.ClassLoader.loadClass(ClassLoader.java:424)
at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:331)
at java.lang.ClassLoader.loadClass(ClassLoader.java:357)
at SyncMapTest.main(SyncMapTest.java:6)
姝ゆ椂鏄敱鏂規(guī)硶ClassLoader.defineClass1()鎶涘嚭鐨凷ecurityException銆備絾榪欐槸涓涓猲ative鏂規(guī)硶錛岄偅涔堜粎閫氳繃淇敼Java浠ｇ爜鏄棤娉曡В鍐寵繖涓棶棰樼殑(JDK鐪熸槸灞傚眰璁鵑槻鍟?銆傚師鏉ュ湪Hotspot鐨凜++婧愭枃浠秇otspot/src/share/vm/classfile/systemDictionary.cpp涓湁濡備笅璇彞錛?br />at java.lang.ClassLoader.defineClass1(Native Method)
at java.lang.ClassLoader.defineClass(ClassLoader.java:760)
at java.security.SecureClassLoader.defineClass(SecureClassLoader.java:142)
at java.net.URLClassLoader.defineClass(URLClassLoader.java:467)
at java.net.URLClassLoader.access$100(URLClassLoader.java:73)
at java.net.URLClassLoader$1.run(URLClassLoader.java:368)
at java.net.URLClassLoader$1.run(URLClassLoader.java:362)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(URLClassLoader.java:361)
at java.lang.ClassLoader.loadClass(ClassLoader.java:424)
at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:331)
at java.lang.ClassLoader.loadClass(ClassLoader.java:357)
at SyncMapTest.main(SyncMapTest.java:6)
const char* pkg = "java/";
if (!HAS_PENDING_EXCEPTION &&
!class_loader.is_null() &&
parsed_name != NULL &&
!strncmp((const char*)parsed_name->bytes(), pkg, strlen(pkg))) {
// It is illegal to define classes in the "java." package from
// JVM_DefineClass or jni_DefineClass unless you're the bootclassloader
ResourceMark rm(THREAD);
char* name = parsed_name->as_C_string();
char* index = strrchr(name, '/');
*index = '\0'; // chop to just the package name
while ((index = strchr(name, '/')) != NULL) {
*index = '.'; // replace '/' with '.' in package name
}
const char* fmt = "Prohibited package name: %s";
size_t len = strlen(fmt) + strlen(name);
char* message = NEW_RESOURCE_ARRAY(char, len);
jio_snprintf(message, len, fmt, name);
Exceptions::_throw_msg(THREAD_AND_LOCATION,
vmSymbols::java_lang_SecurityException(), message);
}
淇敼璇ユ枃浠朵互鍘婚櫎鎺夌浉鍏抽檺鍒訛紝騫舵寜鐓ф湰緋誨垪鐨?a href="http://www.tkk7.com/jiangshachina/archive/2015/10/30/427994.html">絎竴綃囨枃绔?/a>涓粙緇嶇殑鏂規(guī)硶鍘婚噸鏂版瀯寤轟竴涓狾penJDK銆傞偅涔堬紝榪欎釜鏂扮殑JDK灝嗕笉浼?xì)鍐嶅鍖呭悕鏈変恢M綍闄愬埗浜嗐?br />if (!HAS_PENDING_EXCEPTION &&
!class_loader.is_null() &&
parsed_name != NULL &&
!strncmp((const char*)parsed_name->bytes(), pkg, strlen(pkg))) {
// It is illegal to define classes in the "java." package from
// JVM_DefineClass or jni_DefineClass unless you're the bootclassloader
ResourceMark rm(THREAD);
char* name = parsed_name->as_C_string();
char* index = strrchr(name, '/');
*index = '\0'; // chop to just the package name
while ((index = strchr(name, '/')) != NULL) {
*index = '.'; // replace '/' with '.' in package name
}
const char* fmt = "Prohibited package name: %s";
size_t len = strlen(fmt) + strlen(name);
char* message = NEW_RESOURCE_ARRAY(char, len);
jio_snprintf(message, len, fmt, name);
Exceptions::_throw_msg(THREAD_AND_LOCATION,
vmSymbols::java_lang_SecurityException(), message);
}
3. 瑕嗙洊Java鏍稿績API錛?/strong>
寮鍙戣呬滑鍦ㄤ嬌鐢ㄤ富嫻両DE鏃朵細(xì)鍙戠幇錛屽鏋滃伐紼嬫湁澶氫釜jar鏂囦歡鎴栨簮鏂囦歡鐩綍涓寘鍚浉鍚岀殑綾伙紝榪欎簺IDE浼?xì)鏍规嵁鐢ㄦ堜h寚瀹氱殑浼樺厛綰ч『搴忔潵鍔犺澆榪欎簺綾匯傛瘮濡傦紝鍦‥clipse涓紝鍙抽敭鐐瑰嚮鏌愪釜Java宸ョ▼-->灞炴?->Java Build Path-->Order and Export錛屽湪榪欓噷璋冩暣鍚勪釜綾誨簱鎴栨簮鏂囦歡鐩綍鐨勪綅緗紝鍗沖彲鎸囧畾鍔犺澆綾葷殑浼樺厛綰с?br />褰撳紑鍙戣呭湪浣跨敤鏌愪釜寮婧愮被搴?jar鏂囦歡)鏃訛紝鎯沖鍏朵腑鏌愪釜綾昏繘琛屼慨鏀癸紝閭ｄ箞灝卞彲浠ュ皢璇ョ被鐨勬簮浠ｇ爜澶嶅埗鍑烘潵錛屽茍鍦↗ava宸ョ▼涓垱寤轟竴涓悓鍚嶇被錛岀劧鍚庢寚瀹欵clipse浼樺厛鍔犳伅鑷繁鍒涘緩鐨勭被銆傚嵆錛屽湪緙栬瘧鏃朵笌榪愯鏃剁敤鑷繁鍒涘緩鐨勭被鍘昏鐩栫被搴撲腑鐨勫悓鍚嶇被銆傞偅涔堬紝鏄惁鍙互濡傛硶鐐埗鍘昏鐩朖ava鏍稿績API涓殑綾誨憿錛?br />鑰冭檻鍘昏鐩栫被java.util.HashMap錛屽彧鏄畝鍗曞湪瀹冪殑put()鏂規(guī)硶娣誨姞涓鏉℃墦鍗拌銆傞偅涔堝氨闇瑕佸皢src.zip涓殑java/util/HashMap.java澶嶅埗鍑烘潵錛屽茍鍦ㄥ綋鍓岼ava宸ョ▼涓垱寤轟竴涓悓鍚嶇被java.util.HashMap錛屽茍淇敼put()鏂規(guī)硶錛屽涓嬫墍紺猴細(xì)
寮鍙戣呬滑鍦ㄤ嬌鐢ㄤ富嫻両DE鏃朵細(xì)鍙戠幇錛屽鏋滃伐紼嬫湁澶氫釜jar鏂囦歡鎴栨簮鏂囦歡鐩綍涓寘鍚浉鍚岀殑綾伙紝榪欎簺IDE浼?xì)鏍规嵁鐢ㄦ堜h寚瀹氱殑浼樺厛綰ч『搴忔潵鍔犺澆榪欎簺綾匯傛瘮濡傦紝鍦‥clipse涓紝鍙抽敭鐐瑰嚮鏌愪釜Java宸ョ▼-->灞炴?->Java Build Path-->Order and Export錛屽湪榪欓噷璋冩暣鍚勪釜綾誨簱鎴栨簮鏂囦歡鐩綍鐨勪綅緗紝鍗沖彲鎸囧畾鍔犺澆綾葷殑浼樺厛綰с?br />褰撳紑鍙戣呭湪浣跨敤鏌愪釜寮婧愮被搴?jar鏂囦歡)鏃訛紝鎯沖鍏朵腑鏌愪釜綾昏繘琛屼慨鏀癸紝閭ｄ箞灝卞彲浠ュ皢璇ョ被鐨勬簮浠ｇ爜澶嶅埗鍑烘潵錛屽茍鍦↗ava宸ョ▼涓垱寤轟竴涓悓鍚嶇被錛岀劧鍚庢寚瀹欵clipse浼樺厛鍔犳伅鑷繁鍒涘緩鐨勭被銆傚嵆錛屽湪緙栬瘧鏃朵笌榪愯鏃剁敤鑷繁鍒涘緩鐨勭被鍘昏鐩栫被搴撲腑鐨勫悓鍚嶇被銆傞偅涔堬紝鏄惁鍙互濡傛硶鐐埗鍘昏鐩朖ava鏍稿績API涓殑綾誨憿錛?br />鑰冭檻鍘昏鐩栫被java.util.HashMap錛屽彧鏄畝鍗曞湪瀹冪殑put()鏂規(guī)硶娣誨姞涓鏉℃墦鍗拌銆傞偅涔堝氨闇瑕佸皢src.zip涓殑java/util/HashMap.java澶嶅埗鍑烘潵錛屽茍鍦ㄥ綋鍓岼ava宸ョ▼涓垱寤轟竴涓悓鍚嶇被java.util.HashMap錛屽茍淇敼put()鏂規(guī)硶錛屽涓嬫墍紺猴細(xì)
package java.util;
public class HashMap<K,V> extends AbstractMap<K,V>
implements Map<K,V>, Cloneable, Serializable {
.
public V put(K key, V value) {
System.out.printf("put - key=%s, value=%s%n", key, value);
return putVal(hash(key), key, value, false, true);
}
}
姝ゆ椂錛屽湪Eclipse鐜涓紝SynchronizedHashMap浣跨敤鐨刯ava.util.HashMap琚涓烘槸涓婅堪鏂板垱寤虹殑HashMap綾匯傞偅涔堣繍琛屽簲鐢ㄧ▼搴廠yncMapTest鍚庣殑鏈熸湜杈撳嚭搴旇濡備笅鎵紺猴細(xì)public class HashMap<K,V> extends AbstractMap<K,V>
implements Map<K,V>, Cloneable, Serializable {
.public V put(K key, V value) {
System.out.printf("put - key=%s, value=%s%n", key, value);
return putVal(hash(key), key, value, false, true);
}
}
put - key=Key, value=Value
Value
浣嗚繍琛孲yncMapTest鍚庣殑瀹為檯杈撳嚭鍗翠負(fù)濡備笅錛?br />Value
Value
鐪嬭搗鏉ワ紝鏂板垱寤虹殑java.util.HashMap騫舵病鏈夎浣跨敤涓娿傝繖鏄負(fù)浠涔堝憿錛熻兘澶?鎯沖儚"鍒扮殑鍘熷洜榪樻槸綾誨姞杞藉櫒銆傚叧浜嶫ava綾誨姞杞藉櫒鐨勮璁鴻秴鍑轟簡鏈枃鐨勮寖鍥達(dá)紝鑰屼笖鍏充簬璇ヤ富棰樼殑鏂囩珷宸叉槸姹楃墰鍏呮爧錛屼絾鏈枃浠嶄細(xì)綆榪板叾瑕佺偣銆?br />Java綾誨姞杞藉櫒鐢變笅鑷充笂鍒嗕負(fù)涓変釜灞傛錛氬紩瀵肩被鍔犺澆鍣?Bootstrap Class Loader)錛屾墿灞曠被鍔犺澆鍣?Extension Class Loader)鍜屽簲鐢ㄧ▼搴忕被鍔犺澆鍣?Application Class Loader)銆傚叾涓紩瀵肩被鍔犺澆鍣ㄧ敤浜庡姞杞絩t.jar榪欐牱鐨勬牳蹇冪被搴撱傚茍涓斿紩瀵肩被鍔犺澆鍣ㄤ負(fù)鎵╁睍綾誨姞杞藉櫒鐨勭埗鍔犺澆鍣紝鑰屾墿灞曠被鍔犺澆鍣ㄥ張涓哄簲鐢ㄧ▼搴忕被鍔犺澆鍣ㄧ殑鐖跺姞杞藉櫒銆傚悓鏃禞VM鍦ㄥ姞杞界被鏃跺疄琛屽鎵樻ā寮忋傚嵆錛屽綋鍓嶇被鍔犺澆鍣ㄥ湪鍔犺澆綾繪椂錛屼細(xì)棣栧厛濮旀墭鑷繁鐨勭埗鍔犺澆鍣ㄥ幓榪涜鍔犺澆銆傚鏋滅埗鍔犺澆鍣ㄥ凡緇忓姞杞戒簡鏌愪釜綾伙紝閭ｄ箞瀛愬姞杞藉櫒灝嗕笉浼?xì)鍐崑啤鍔犺浇銆?br />鐢變笂鍙煡錛屽綋搴旂敤紼嬪簭璇曞浘鍔犺澆java.util.Map鏃訛紝瀹冧細(xì)棣栧厛閫愮駭鍚戜笂濮旀墭鐖跺姞杞藉櫒鍘誨姞杞借綾伙紝鐩村埌寮曞綾誨姞杞藉櫒鍔犺澆鍒皉t.jar涓殑java.util.HashMap銆傜敱浜庤綾誨凡緇忚鍔犺澆浜嗭紝鎴戜滑鑷繁鍒涘緩鐨刯ava.util.HashMap灝變笉浼?xì)琚噸澶嶅姞铦层?br />浣跨敤java鍛戒護(hù)榪愯SyncMapTest紼嬪簭鏃跺姞涓奦M鍙傛暟-verbose:class錛屼細(xì)鍦ㄧ獥鍙ｄ腑鎵撳嵃鍑哄艦寮忓涓嬬殑璇彞錛?br />[Opened /home/ubuntu/jdk1.8.0_custom/jre/lib/rt.jar]
[Loaded java.lang.Object from /home/ubuntu/jdk1.8.0_custom/jre/lib/rt.jar]
[Loaded java.util.HashMap from /home/ubuntu/jdk1.8.0_custom/jre/lib/rt.jar]
[Loaded java.util.HashMap$Node from /home/ubuntu/jdk1.8.0_custom/jre/lib/rt.jar]
[Loaded java.util.SynchronizedHashMap from file:/home/ubuntu/projects/test/classes/]
Value
[Loaded java.lang.Shutdown from /home/ubuntu/jdk1.8.0_custom/jre/lib/rt.jar]
[Loaded java.lang.Shutdown$Lock from /home/ubuntu/jdk1.8.0_custom/jre/lib/rt.jar]
浠庝腑鍙互鐪嬪嚭錛岀被java.util.HashMap紜疄鏄粠rt.jar涓姞杞藉埌鐨勩備絾鐞嗚涓婏紝鍙互閫氳繃鑷畾涔夌被鍔犺澆鍣ㄥ幓鎵撶牬濮旀墭妯″紡錛岀劧鑰岃繖灝辨槸鍙︿竴涓瘽棰樹簡銆?/div>[Loaded java.lang.Object from /home/ubuntu/jdk1.8.0_custom/jre/lib/rt.jar]
[Loaded java.util.HashMap from /home/ubuntu/jdk1.8.0_custom/jre/lib/rt.jar]
[Loaded java.util.HashMap$Node from /home/ubuntu/jdk1.8.0_custom/jre/lib/rt.jar]
[Loaded java.util.SynchronizedHashMap from file:/home/ubuntu/projects/test/classes/]
Value
[Loaded java.lang.Shutdown from /home/ubuntu/jdk1.8.0_custom/jre/lib/rt.jar]
[Loaded java.lang.Shutdown$Lock from /home/ubuntu/jdk1.8.0_custom/jre/lib/rt.jar]
]]>
Play OpenJDK: 鏋勫緩浣犺嚜宸辯殑JDK
璁″垝浣縋lay OpenJDK鎴愪負(fù)涓緇勪粙緇嶅浣曚嬌鐢ㄥ茍鍙備笌OpenJDK欏圭洰鐨勭郴鍒楁枃绔犮傛湰鏂囨槸璇ョ郴鍒楃殑絎竴綃囨枃绔狅紝瀹冨熀浜嶰penJDK 8鐨勬簮浠ｇ爜浠嬬粛浜嗘瀯寤轟竴涓睘浜庤嚜宸辯殑JDK鏂規(guī)硶銆?2015.10.30鏈鍚庢洿鏂?
1. OpenJDK
鏇劇粡鐨凷un Microsystems. Inc錛屼篃灝辨槸Java璇█鐨勫彂鏄庤咃紝灝嗗畠鐨凧DK浠ｇ爜璐＄尞鍑烘潵錛屾垚绔嬩簡涓涓紑婧愰」鐩紝鍗?a >OpenJDK銆?br /> 鍚屾椂錛屽畠涔熸槸涓涓ぞ鍖恒傜浉鍏崇殑鍏徃錛岀粍緇囧拰涓漢鍦ㄨ繖涓ぞ鍖轟腑鍗忎綔寮鍙慜penJDK銆傜ぞ鍖烘牴鎹笉鍚岀殑棰嗗煙鎴栭」鐩彁渚涗簡涓緋誨垪鐨?a >閭歡鍒楄〃錛屽埄鐩婄浉鍏蟲柟鎴栧鍏舵劅鍏磋叮鐨勪釜浜洪兘鍙互璁㈤槄榪欎簺閭歡鍒楄〃鍘昏繘琛屽叧娉ㄥ拰璁ㄨ銆備緥濡傦紝Java鏍稿績API鐨勯偖浠跺垪琛ㄦ槸core-libs-dev@openjdk.java.net錛屽叧浜巎ava.lang錛宩ava.util絳夋牳蹇傾PI鐨勬柊鐗規(guī)ч兘浼?xì)鍦q欓噷榪涜璁ㄨ錛屽茍瀵瑰叾鏈緇堢殑瀹炵幇浠ｇ爜榪涜瀹℃煡銆備換浣曞皢瑕佽繘鍏penJDK鐗堟湰搴撶殑婧愪唬鐮侊紝鏃犺鏄駭鍝佷唬鐮?鍗籌紝瑕侀殢JDK鍙戝竷鐨勭▼搴?錛岃繕鏄祴璇曚唬鐮侊紝閮介渶瑕佸湪紺懼尯涓繘琛屽叕寮鐨勪唬鐮佸鏌ャ?br /> 閫夋嫨涓涓嚜宸辨劅鍏磋叮鐨勯鍩熸垨欏圭洰錛屽姞鍏ュ畠鐨勯偖浠跺垪琛紝闀挎湡璺熻釜瀹冪殑鍙戝睍錛岀湅鐫涓撳浠殑璁ㄨ銆佷簤璁烘帹鍔↗DK鐨勬紨榪涳紝瀛︿範(fàn)寮鍙戣呬滑鐨凙PI璁捐涓庝唬鐮佸疄鐜幫紝...錛岃繖浜涘鑷繁鐨勬垚闀塊兘鏄瀬鏈夊府鍔╃殑銆備篃璁革紝榪樿兘鐪嬪埌涓浜涙湁瓚ｇ殑鍏崷;-)
2. 鍑嗗宸ヤ綔
鍦ㄥ嚑縐嶄富嫻佹搷浣滅郴緇燂紝Linux(濡俇buntu鍜孎edora)錛學(xué)indows(7鍜?)錛孧acOS(Lion鍜孧outain Lion)錛屼腑閮藉彲浠ユ瀯寤篛penJDK錛屽叿浣撶殑緇嗚妭鍙互鍙傝瀹樻柟鐨勪竴綃囨枃妗?/a>銆?br /> 鏈枃閫夋嫨浣跨敤Ubuntu 14.04銆傚潶鐧藉湴璇達(dá)紝閫夋嫨浣跨敤Ubuntu錛屽疄鏄洜涓哄湪Linux鐜涓瀯寤篛penJDK闈炲父綆鍗曘傝嫢鍦╓indows涓繘琛屾瀯寤猴紝鍒欓渶瑕佸畨瑁匳isual Studio C++緙栬瘧鍣ㄣ侻acOS錛熷棷錛屾垜娌℃湁MBP銆傚彲鑳芥洿澶氫漢騫蟲椂鏄嬌鐢╓indows錛屼絾瀹夎涓涓狶inux涔熶笉楹葷儲銆傚厛瀹夎鍏嶈垂鐨刅M宸ュ叿VirtaulBox錛屽啀鍘諱笅杞経buntu鐨?a >ISO鏂囦歡錛岀劧鍚庝嬌鐢╒irtualBox鍘誨畨瑁匲buntu銆俈irtualBox綆鍗曟槗鐢紝緗戜笂鐨勭浉鍏寵祫鏂欎篃闈炲父鐨勫銆?br /> OpenJDK鐨勬簮鏂囦歡鐗堟湰搴撳熀浜?a >Mercurial(hg)錛屽畠鏄竴涓笌Git鐩鎬技鐨勫垎甯冨紡鐗堟湰鎺у埗宸ュ叿銆傚湪Ubuntu涓畨瑁匨ercurial鍙渶瑕佹墽琛屽懡浠?br />
$ sudo apt-get install mercurial
OpenJDK涓悇欏圭洰鐨勬簮浠ｇ爜鐗堟湰搴撶殑璺緞鍧囧湪http://hg.openjdk.java.net/涔嬩笅錛屽湪榪欓噷鍙互鎵懼埌6錛?錛?錛?鍜孞igsaw鐨勬簮浠ｇ爜銆傚叾涓璊DK 8鐨勬渶鏂板紑鍙戠増鏈簱璺緞涓篽ttp://hg.openjdk.java.net/jdk8u/jdk8u-dev/銆?br /> 鍙﹀錛屾瀯寤篛penJDK鏃墮渶瑕佷竴涓惎鍔↗DK錛屾湰鏂囬夋嫨鏋勫緩OpenJDK 8錛岄偅涔堝惎鍔↗DK鐨勭増鏈簲涓嶄綆浜?銆?br />3. 涓嬭澆婧愪唬鐮?/span>
鍏嬮殕鐗堟湰搴擄紝
$ hg clone http://hg.openjdk.java.net/jdk8u/jdk8u-dev/ jdk8-src
requesting all changes
adding changesets
adding manifests
adding file changes
added 1570 changesets with 1958 changes to 141 files
updating to branch default
85 files updated, 0 files merged, 0 files removed, 0 files unresolved
榪涘叆婧愪唬鐮佺洰褰?br />requesting all changes
adding changesets
adding manifests
adding file changes
added 1570 changesets with 1958 changes to 141 files
updating to branch default
85 files updated, 0 files merged, 0 files removed, 0 files unresolved
$ cd jdk8-src/
OpenJDK鐨勬簮浠ｇ爜鐗堟湰搴撳疄闄呬笂鍖呭惈澶氫釜鐙珛鐨勫瓙鐗堟湰搴擄紝闇瑕佹墽琛屽涓嬭剼鏈幓鍒嗗埆涓嬭澆鍚勪釜瀛愮増鏈簱鐨勬簮浠ｇ爜錛?br />$ sh get_source.sh
# Repositories: corba jaxp jaxws langtools jdk hotspot nashorn
corba: hg clone http://hg.openjdk.java.net/jdk8u/jdk8u-dev/corba corba
jaxp: hg clone http://hg.openjdk.java.net/jdk8u/jdk8u-dev/jaxp jaxp
corba: requesting all changes
jaxp: requesting all changes
# Repositories: corba jaxp jaxws langtools jdk hotspot nashorn
corba: hg clone http://hg.openjdk.java.net/jdk8u/jdk8u-dev/corba corba
jaxp: hg clone http://hg.openjdk.java.net/jdk8u/jdk8u-dev/jaxp jaxp
corba: requesting all changes
jaxp: requesting all changes
4. 鏋勫緩
璋冪敤configure榪涜棰勬瀯寤猴紝鍏朵腑鐨勫弬鏁?-with-boot-jdk鐢ㄤ簬鎸囧畾鍚姩JDK鐨勮礬寰勩傚鏋滃惎鍔↗DK鐨刯ava鍛戒護(hù)宸插瓨鍦ㄤ簬PATH鐜鍙橀噺涓紝璇ュ弬鏁板彲浠ュ拷鐣ャ?br />
$ sh configure --with-boot-jdk=/path/to/boot/jdk
璇ヨ繃紼嬩細(xì)媯(gè)嫻嬫瀯寤虹幆澧冩槸鍚︾鍚堣姹傦紝濡傛湁闂錛屽畠浼?xì)缁欏嚭鎻惤C恒傛瘮濡傦紝configure: error: Could not find X11 libraries. You might be able to fix this by running 'sudo apt-get install libX11-dev libxext-dev libxrender-dev libxtst-dev libxt-dev'.
姝ゆ椂鏍規(guī)嵁鎻愮ず瀹夎鎵闇瑕佺殑搴撳嵆鍙傚啀閲嶆柊鎵ц涓婅堪configure鍛戒護(hù)錛屽彲鑳借繕浼?xì)鎻惤C虹己灝戝叾瀹冪殑搴擄紝閭ｄ箞鍐嶆鏍規(guī)嵁鎻愮ず榪涜瀹夎銆傚姝ゅ弽澶嶏紝鍙埌棰勬瀯寤烘垚鍔熷畬鎴愩?br />鏈鍚庡氨鏄繘琛屾瀯寤猴紝鐩存帴鎵ц濡備笅鍛戒護(hù)錛?br />$ make all
鍦ㄦ榪囩▼涓彲浠ヤ細(xì)閬囧埌涓浜涜鍛婏紝涓嶅繀鐞嗕細(xì)錛岃愬績絳夊緟...瀹屾垚鍚庯紝浼?xì)鍑虹幇濡備笅鐨勬眹鎬諱俊鎭紝----- Build times -------
Start 2015-10-30 22:11:10
End 2015-10-30 22:52:54
00:01:01 corba
00:01:08 demos
00:06:49 docs
00:19:37 hotspot
00:01:47 images
00:00:35 jaxp
00:00:49 jaxws
00:08:23 jdk
00:01:09 langtools
00:00:25 nashorn
00:41:44 TOTAL
-------------------------
Finished building OpenJDK for target 'all'
Start 2015-10-30 22:11:10
End 2015-10-30 22:52:54
00:01:01 corba
00:01:08 demos
00:06:49 docs
00:19:37 hotspot
00:01:47 images
00:00:35 jaxp
00:00:49 jaxws
00:08:23 jdk
00:01:09 langtools
00:00:25 nashorn
00:41:44 TOTAL
-------------------------
Finished building OpenJDK for target 'all'
$ build/linux-x86_64-normal-server-release/images/jdk/bin/java -version
openjdk version "1.8.0-internal"
OpenJDK Runtime Environment (build 1.8.0-internal-ubuntu_2015_10_30_22_07-b00)
OpenJDK 64-Bit Server VM (build 25.66-b00, mixed mode)
openjdk version "1.8.0-internal"
OpenJDK Runtime Environment (build 1.8.0-internal-ubuntu_2015_10_30_22_07-b00)
OpenJDK 64-Bit Server VM (build 25.66-b00, mixed mode)
]]>