使用分析工具在java代码中查找outOfMemoryError的确切原因
嗨，我有一个java程序，可以使用JDBC同时访问远程和本地数据库 但我有一个例外： ->线程“thread-1964”java.lang.OutOfMemoryError中出现异常：java堆空间 现在我想使用任何分析工具，通过它我可以在我的代码中得到这个异常的确切原因 这是我的java程序使用分析工具在java代码中查找outOfMemoryError的确切原因,java,linux,jdbc,Java,Linux,Jdbc,嗨，我有一个java程序，可以使用JDBC同时访问远程和本地数据库 但我有一个例外： ->线程“thread-1964”java.lang.OutOfMemoryError中出现异常：java堆空间 现在我想使用任何分析工具，通过它我可以在我的代码中得到这个异常的确切原因 这是我的java程序 public class DBTestCases{ Connection localConnection; Connection remoteConnection; Conne
public class DBTestCases{
Connection localConnection;
Connection remoteConnection;
Connection localCon;
Connection remoteCon;
List<Connection> connectionsList;
String driver = "com.mysql.jdbc.Driver";
String user = "root";
String password = "root";
String dbName = "myDB";
String connectionUrl1= "jdbc:mysql://11.232.33:3306/"+dbName+"?user="+user+"&password="+password+"&useUnicode=true&characterEncoding=UTF-8&autoReconnect=true&failOverReadOnly=false&maxReconnects=10";
String connectionUrl2= "jdbc:mysql://localhost:3306/"+dbName+"?user="+user+"&password="+password+"&useUnicode=true&characterEncoding=UTF-8&autoReconnect=true&failOverReadOnly=false&maxReconnects=10";
public List<Connection> createConnection() {
try {
Class.forName(driver);
localCon = DriverManager.getConnection(connectionUrl2);
if(localCon != null)
System.out.println("connected to remote database at : "+new Date());
remoteCon = DriverManager.getConnection(connectionUrl1);
if(remoteCon != null)
System.out.println("connected to local database at : "+new Date());
connectionsList = new ArrayList<Connection>( 2 );
connectionsList.add( 0 , localCon );
connectionsList.add( 1 , remoteCon );
} catch(ClassNotFoundException cnfe) {
cnfe.printStackTrace();
} catch(SQLException sqle) {
sqle.printStackTrace();
}
return connectionsList;
}
public void insert(){
Runnable runnable = new Runnable(){
public void run() {
PreparedStatement ps1 = null;
PreparedStatement ps2 = null;
String sql = "insert into user1(name, address, created_date)" +
" values('johnsan', 'usa', '2013-08-04')";
if(remoteConnection != null&&localConnection != null) {
System.out.println("Database Connection Is Established");
try {
ps1 = remoteConnection.prepareStatement(sql);
ps2 = localConnection.prepareStatement(sql);
int i = ps1.executeUpdate();
int k = ps2.executeUpdate();
if(i > 0) {
System.out.println("Data Inserted into remote database table Successfully");
}
if(k > 0) {
System.out.println("Data Inserted into local database table Successfully");
}
} catch (SQLException s) {
System.out.println("SQL code does not execute.");
s.printStackTrace();
}catch (Exception e) {
e.printStackTrace();
}
}
System.out.println("Inserting values in db");
}
};
Thread thread = new Thread(runnable);
thread.start();
}
public void retrieve(){
Runnable runnable = new Runnable(){
public void run() {
try {
Statement st1 = localConnection.createStatement();
Statement st2 = remoteConnection.createStatement();
ResultSet res1 = st1.executeQuery("SELECT * FROM user1");
ResultSet res2 = st2.executeQuery("SELECT * FROM user1");
System.out.println("---------------------------Local Database------------------------");
while (res1.next()) {
Long i = res1.getLong("userId");
String s1 = res1.getString("name");
String s2 = res1.getString("address");
java.sql.Date d = res1.getDate("created_date");
System.out.println(i + "\t\t" + s1 + "\t\t" + s2 + "\t\t"+ d);
}
System.out.println("------------------------Remote Database---------------------");
while (res2.next()) {
Long i = res2.getLong("userId");
String s1 = res2.getString("name");
String s2 = res2.getString("address");
java.sql.Date d = res2.getDate("created_date");
System.out.println(i + "\t\t" + s1 + "\t\t" + s2 + "\t\t"+ d);
}
} catch (SQLException s) {
System.out.println("SQL code does not execute.");
s.printStackTrace();
}catch (Exception e) {
e.printStackTrace();
}
}
};
Thread thread = new Thread(runnable);
thread.start();
}
public static void main(String[] args) {
DBTestCases dbTestCases = new DBTestCases();
List l = dbTestCases.createConnection();
dbTestCases.localConnection = (Connection)l.get(0);
dbTestCases.remoteConnection = (Connection)l.get(1);
for(;;) {
dbTestCases.insert();
dbTestCases.countRows();
dbTestCases.retrieve();
}
}
}
公共类DBTestCases{
连接本地连接；
连接远程连接；
连接localCon；
远程连接；
列表连接列表；
String driver=“com.mysql.jdbc.driver”；
字符串user=“root”；
字符串password=“root”；
字符串dbName=“myDB”；
String connectionUrl1=“jdbc:mysql://11.232.33:3306/“+dbName+”？user=“+user+”&password=“+password+”&useUnicode=true&characterEncoding=UTF-8&autoReconnect=true&failOverReadOnly=false&maxReconnects=10”；
String connectionUrl2=“jdbc:mysql://localhost:3306/“+dbName+”？user=“+user+”&password=“+password+”&useUnicode=true&characterEncoding=UTF-8&autoReconnect=true&failOverReadOnly=false&maxReconnects=10”；
公共列表createConnection（）{
试一试{
Class.forName（驱动程序）；
localCon=DriverManager.getConnection（connectionUrl2）；
如果（localCon！=null）
System.out.println（“连接到远程数据库：“+new Date（）”）；
remoteCon=DriverManager.getConnection（connectionUrl1）；
if（remoteCon！=null）
System.out.println（“连接到本地数据库：“+new Date（）”）；
connectionsList=newarraylist（2）；
connectionsList.add（0，localCon）；
connectionsList.add（1，remoteCon）；
}捕获（ClassNotFoundException cnfe）{
cnfe.printStackTrace（）；
}捕获（SQLException sqle）{
printStackTrace（）；
}
返回连接列表；
}
公开作废插入（）{
Runnable Runnable=新的Runnable（）{
公开募捐{
PreparedStatement ps1=null；
PreparedStatement ps2=null；
String sql=“插入user1（名称、地址、创建日期）”+
“价值观（‘约翰森’、‘美国’、‘2013-08-04’）”；
if（remoteConnection！=null&&localConnection！=null）{
System.out.println（“已建立数据库连接”）；
试一试{
ps1=remoteConnection.prepareStatement（sql）；
ps2=localConnection.prepareStatement（sql）；
int i=ps1.executeUpdate（）；
int k=ps2.executeUpdate（）；
如果（i>0）{
System.out.println（“数据成功插入远程数据库表”）；
}
如果（k>0）{
System.out.println（“数据成功插入本地数据库表”）；
}
}捕获（SQLS异常）{
System.out.println（“SQL代码不执行”）；
s、 printStackTrace（）；
}捕获（例外e）{
e、 printStackTrace（）；
}
}
System.out.println（“在db中插入值”）；
}
};
线程线程=新线程（可运行）；
thread.start（）；
}
公共无效检索（）{
Runnable Runnable=新的Runnable（）{
公开募捐{
试一试{
语句st1=localConnection.createStatement（）；
语句st2=remoteConnection.createStatement（）；
ResultSet res1=st1.executeQuery（“从user1中选择*）；
ResultSet res2=st2.executeQuery（“从用户1中选择*）；
System.out.println（“-------------------------------本地数据库------------------------------------------”；
while（res1.next（））{
Long i=res1.getLong（“userId”）；
字符串s1=res1.getString（“名称”）；
字符串s2=res1.getString（“地址”）；
java.sql.Date d=res1.getDate（“创建日期”）；
System.out.println（i+“\t\t”+s1+“\t\t”+s2+“\t\t”+d）；
}
System.out.println（“---------------------------远程数据库------------------------------------------”；
while（res2.next（））{
Long i=res2.getLong（“userId”）；
字符串s1=res2.getString（“名称”）；
字符串s2=res2.getString（“地址”）；
java.sql.Date d=res2.getDate（“创建日期”）；
System.out.println（i+“\t\t”+s1+“\t\t”+s2+“\t\t”+d）；
}
}捕获（SQLS异常）{
System.out.println（“SQL代码不执行”）；
s、 printStackTrace（）；
}捕获（例外e）{
e、 printStackTrace（）；
}
}
};
线程线程=新线程（可运行）；
thread.start（）；
}
公共静态void main（字符串[]args）{
DBTestCases DBTestCases=新的DBTestCases（）；
List l=dbTestCases.createConnection（）；
dbTestCases.localConnection=（Connection）l.get（0）；
dbTestCases.remoteConnection=（Connection）l.get（1）；
对于（；；）{
dbTestCases.insert（）；
dbTestCases.countRows（）；
dbTestCases.retrieve（）；
}
}
}
ps1 = remoteConnection.prepareStatement(sql);
ps2 = localConnection.prepareStatement(sql);
int i = ps1.executeUpdate();
int k = ps2.executeUpdate();
Statement st1 = localConnection.createStatement();
Statement st2 = remoteConnection.createStatement();
ResultSet res1 = st1.executeQuery("SELECT * FROM user1");
ResultSet res2 = st2.executeQuery("SELECT * FROM user1");
public class DBTestCases {
Connection localConnection;
Connection remoteConnection;
Connection localCon;
Connection remoteCon;
List<Connection> connectionsList;
String driver = "com.mysql.jdbc.Driver";
String user = "root";
String password = "root";
String dbName = "myDB";
String connectionUrl1= "jdbc:mysql://11.232.33:3306/"+dbName+"?user="+user+"&password="+password+"&useUnicode=true&characterEncoding=UTF-8&autoReconnect=true&failOverReadOnly=false&maxReconnects=10";
String connectionUrl2= "jdbc:mysql://localhost:3306/"+dbName+"?user="+user+"&password="+password+"&useUnicode=true&characterEncoding=UTF-8&autoReconnect=true&failOverReadOnly=false&maxReconnects=10";
public List<Connection> createConnection() {
try {
Class.forName(driver);
localCon = DriverManager.getConnection(connectionUrl2);
if(localCon != null)
System.out.println("connected to remote database at : "+new Date());
remoteCon = DriverManager.getConnection(connectionUrl1);
if(remoteCon != null)
System.out.println("connected to local database at : "+new Date());
connectionsList = new ArrayList<Connection>( 2 );
connectionsList.add( 0 , localCon );
connectionsList.add( 1 , remoteCon );
} catch(ClassNotFoundException cnfe) {
cnfe.printStackTrace();
} catch(SQLException sqle) {
sqle.printStackTrace();
}
return connectionsList;
}
public void insert(){
Runnable runnable = new Runnable(){
public void run() {
PreparedStatement ps1 = null;
PreparedStatement ps2 = null;
String sql = "insert into user1(name, address, created_date)" +
" values('johnsan', 'usa', '2013-08-04')";
if(remoteConnection != null&&localConnection != null) {
System.out.println("Database Connection Is Established");
try {
ps1 = remoteConnection.prepareStatement(sql);
ps2 = localConnection.prepareStatement(sql);
int i = ps1.executeUpdate();
int k = ps2.executeUpdate();
if(i > 0) {
System.out.println("Data Inserted into remote database table Successfully");
}
if(k > 0) {
System.out.println("Data Inserted into local database table Successfully");
}
} catch (SQLException s) {
System.out.println("SQL code does not execute.");
s.printStackTrace();
}catch (Exception e) {
e.printStackTrace();
} finally {
if (ps1 != null) {
try {
ps1.close();
} catch (SQLException ex) {
System.out.println("Cannot close ps1 statement.");
}
}
if (ps2 != null) {
try {
ps2.close();
} catch (SQLException ex) {
System.out.println("Cannot close ps2 statement.");
}
}
}
}
System.out.println("Inserting values in db");
}
};
Thread thread = new Thread(runnable);
thread.start();
}
public void retrieve(){
Runnable runnable = new Runnable(){
public void run() {
Statement st1 = null;
Statement st2 = null;
ResultSet res1 = null;
ResultSet res2 = null;
try {
st1 = localConnection.createStatement();
st2 = remoteConnection.createStatement();
res1 = st1.executeQuery("SELECT * FROM user1");
res2 = st2.executeQuery("SELECT * FROM user1");
System.out.println("---------------------------Local Database------------------------");
while (res1.next()) {
Long i = res1.getLong("userId");
String s1 = res1.getString("name");
String s2 = res1.getString("address");
java.sql.Date d = res1.getDate("created_date");
System.out.println(i + "\t\t" + s1 + "\t\t" + s2 + "\t\t"+ d);
}
System.out.println("------------------------Remote Database---------------------");
while (res2.next()) {
Long i = res2.getLong("userId");
String s1 = res2.getString("name");
String s2 = res2.getString("address");
java.sql.Date d = res2.getDate("created_date");
System.out.println(i + "\t\t" + s1 + "\t\t" + s2 + "\t\t"+ d);
}
} catch (SQLException s) {
System.out.println("SQL code does not execute.");
s.printStackTrace();
}catch (Exception e) {
e.printStackTrace();
} finally {
if (res1 != null) {
try {
res1.close();
} catch (SQLException ex) {
System.out.println("Cannot close res1 result set.");
}
}
if (st1 != null) {
try {
st1.close();
} catch (SQLException ex) {
System.out.println("Cannot close st1 statement.");
ex.printStackTrace();
}
}
if (res2 != null) {
try {
res2.close();
} catch (SQLException ex) {
System.out.println("Cannot close res2 result set.");
}
}
if (st2 != null) {
try {
st2.close();
} catch (SQLException ex) {
System.out.println("Cannot close st2 statement.");
ex.printStackTrace();
}
}
}
}
};
Thread thread = new Thread(runnable);
thread.start();
}
public static void main(String[] args) {
DBTestCases dbTestCases = new DBTestCases();
List l = dbTestCases.createConnection();
dbTestCases.localConnection = (Connection)l.get(0);
dbTestCases.remoteConnection = (Connection)l.get(1);
for(;;) {
dbTestCases.insert();
dbTestCases.countRows();
dbTestCases.retrieve();
}
}
}
ResultSet res1 = st1.executeQuery("SELECT * FROM user1");
ResultSet res2 = st2.executeQuery("SELECT * FROM user1");
ResultSet res1 = st1.executeQuery("SELECT created_date FROM user1");
ResultSet res2 = st2.executeQuery("SELECT created_date FROM user1");