Pasé de String test += str;
donde test
creció exponencialmente grande con miles y miles de caracteres. Tardó 45 minutos en ejecutarse, probablemente creando cadenas grandes y eliminando basura. Luego escaloné la entrada como esta, lo que la llevó a 30 segundos.StringBuilder error de memoria al trabajar con cadenas grandes en java
Esta parece ser la forma barata de hacerlo, pero funcionó bien:
if (secondDump.length() > 50)
{
intermedDump = intermedDump + secondDump;
secondDump = "";
}
if (intermedDump.length() > 100)
{
thirdDump = thirdDump + intermedDump;
intermedDump = "";
}
if (thirdDump.length() > 500)
{
fourthDump = fourthDump + thirdDump;
thirdDump = "";
}
if (fourthDump.length() > 1000)
{
fifthDump = fifthDump + fourthDump;
fourthDump = "";
}
//with just this and not sixth. Runtime>>>> : 77343
if (fifthDump.length() > 5000)
{
sixthDump = sixthDump + fifthDump;
fifthDump = "";
}
//with just this. Runtime>>>> : 35903Runtime>>>> : 33780
if (sixthDump.length() > 10000)
{
fillerDump = fillerDump + sixthDump;
sixthDump = "";
}
Entonces descubrí que existe StringBuilder
, y he estado tratando de usarlo, ya que, la sustitución de todas las operaciones de cadena con él .
El problema es que sigo obteniendo un java.lang.OutOfMemoryError
con un desbordamiento de pila de memoria Java. Creo que la cadena es demasiado larga para almacenarla en la memoria como un objeto StringBuilder
, porque hace que aproximadamente 1/50th del progreso que mi código anterior hizo antes de fallar con un error de falta de memoria. Solo funciona con quizás menos de mil caracteres.
¿Por qué una cuerda puede contener toda la salida y esto no puede acercarse? Además, si añado texto al JTextPane
, ¿cuánta memoria necesita? Si vuelco el contenido StringBuilder
a JTextpane
y sigo añadiendo y borrando StringBuilder
que tampoco parece funcionar.
Aquí está el código existente. es sólo un objeto que se pasa página:
protected void concatPlates(page PageA) throws IOException
{
if (backend.isFirstPage == false)
{
frontend.fillOutputPane("\n " +
" \n", PageA);
frontend.fillOutputPane(" " +
" \n", PageA);
frontend.fillOutputPane(" " +
" \n", PageA);
}
for (int i = 0; i < PLATELEN-1; i++)
{
if (arrLeftCol[i].length() == 0)
{
/////////////////////////////////////////////////////////
/////////////////////////////////////////////////////////
frontend.fillOutputPane(arrLeftCol[i].append(
arrRightCol[i]));
}
else
{
PageA.tempStrBuff = new StringBuilder(arrLeftCol[i].substring(0,40));
frontend.fillOutputPane(PageA.tempStrBuff.append(arrRightCol[i]));
}
arrLeftCol[i].append("");
arrRightCol[i].append("");
backend.isFirstPage = false;
}
}
//this is the frontend class
public static void fillOutputPane(String s, page PageA)
{
fillOutputPane(PageA.getStrBuf());
}
public static void fillOutputPane(StringBuilder stringBuild)
{
try
{
str.append(stringBuild);
}
catch (java.lang.OutOfMemoryError e)
{
System.out.println((str.length() * 16) /8);
//System.out.println(str);
System.out.println("out of memory error");
System.exit(0);
}
}
Aquí está el error:
Exception in thread "AWT-EventQueue-0" java.lang.OutOfMemoryError: Java heap space
at java.util.Arrays.copyOf(Unknown Source)
at java.lang.AbstractStringBuilder.expandCapacity(Unknown Source)
at java.lang.AbstractStringBuilder.append(Unknown Source)
at java.lang.StringBuilder.append(Unknown Source)
at java.lang.StringBuilder.append(Unknown Source)
at backend.fill(backend.java:603)
at frontend$openL.actionPerformed(frontend.java:191)
at javax.swing.AbstractButton.fireActionPerformed(Unknown Source)
at javax.swing.AbstractButton$Handler.actionPerformed(Unknown Source)
at javax.swing.DefaultButtonModel.fireActionPerformed(Unknown Source)
at javax.swing.DefaultButtonModel.setPressed(Unknown Source)
at javax.swing.AbstractButton.doClick(Unknown Source)
at javax.swing.plaf.basic.BasicMenuItemUI.doClick(Unknown Source)
at javax.swing.plaf.basic.BasicMenuItemUI$Handler.mouseReleased(Unknown Source)
at java.awt.Component.processMouseEvent(Unknown Source)
at javax.swing.JComponent.processMouseEvent(Unknown Source)
at java.awt.Component.processEvent(Unknown Source)
at java.awt.Container.processEvent(Unknown Source)
at java.awt.Component.dispatchEventImpl(Unknown Source)
at java.awt.Container.dispatchEventImpl(Unknown Source)
at java.awt.Component.dispatchEvent(Unknown Source)
at java.awt.LightweightDispatcher.retargetMouseEvent(Unknown Source)
at java.awt.LightweightDispatcher.processMouseEvent(Unknown Source)
at java.awt.LightweightDispatcher.dispatchEvent(Unknown Source)
at java.awt.Container.dispatchEventImpl(Unknown Source)
at java.awt.Window.dispatchEventImpl(Unknown Source)
at java.awt.Component.dispatchEvent(Unknown Source)
at java.awt.EventQueue.dispatchEventImpl(Unknown Source)
at java.awt.EventQueue.access$000(Unknown Source)
at java.awt.EventQueue$1.run(Unknown Source)
at java.awt.EventQueue$1.run(Unknown Source)
at java.security.AccessController.doPrivileged(Native Method)
Creo que esto es lo que es un seguimiento de pila:
java.lang.Exception: Stack trace
at java.lang.Thread.dumpStack(Unknown Source)
at frontend.fillOutputPane(frontend.java:385)
at page.concatPlates(page.java:105)
at backend.setPlate(backend.java:77)
at backend.fill(backend.java:257)
at frontend$openL.actionPerformed(frontend.java:191)
at javax.swing.AbstractButton.fireActionPerformed(Unknown Source)
at javax.swing.AbstractButton$Handler.actionPerformed(Unknown Source)
at javax.swing.DefaultButtonModel.fireActionPerformed(Unknown Source)
at javax.swing.DefaultButtonModel.setPressed(Unknown Source)
at javax.swing.AbstractButton.doClick(Unknown Source)
at javax.swing.plaf.basic.BasicMenuItemUI.doClick(Unknown Source)
at javax.swing.plaf.basic.BasicMenuItemUI$Handler.mouseReleased(Unknown Source)
at java.awt.Component.processMouseEvent(Unknown Source)
at javax.swing.JComponent.processMouseEvent(Unknown Source)
at java.awt.Component.processEvent(Unknown Source)
at java.awt.Container.processEvent(Unknown Source)
at java.awt.Component.dispatchEventImpl(Unknown Source)
at java.awt.Container.dispatchEventImpl(Unknown Source)
at java.awt.Component.dispatchEvent(Unknown Source)
at java.awt.LightweightDispatcher.retargetMouseEvent(Unknown Source)
at java.awt.LightweightDispatcher.processMouseEvent(Unknown Source)
at java.awt.LightweightDispatcher.dispatchEvent(Unknown Source)
at java.awt.Container.dispatchEventImpl(Unknown Source)
at java.awt.Window.dispatchEventImpl(Unknown Source)
at java.awt.Component.dispatchEvent(Unknown Source)
at java.awt.EventQueue.dispatchEventImpl(Unknown Source)
at java.awt.EventQueue.access$000(Unknown Source)
at java.awt.EventQueue$1.run(Unknown Source)
at java.awt.EventQueue$1.run(Unknown Source)
at java.security.AccessController.doPrivileged(Native Method)
at java.security.AccessControlContext$1.doIntersectionPrivilege(Unknown Source)
at java.security.AccessControlContext$1.doIntersectionPrivilege(Unknown Source)
at java.awt.EventQueue$2.run(Unknown Source)
at java.awt.EventQueue$2.run(Unknown Source)
at java.security.AccessController.doPrivileged(Native Method)
at java.security.AccessControlContext$1.doIntersectionPrivilege(Unknown Source)
at java.awt.EventQueue.dispatchEvent(Unknown Source)
at java.awt.EventDispatchThread.pumpOneEventForFilters(Unknown Source)81240560
at java.awt.EventDispatchThread.pumpEventsForFilter(Unknown Source)
at java.awt.EventDispatchThread.pumpEventsForHierarchy(Unknown Source)
at java.awt.EventDispatchThread.pumpEvents(Unknown Source)
at java.awt.EventDispatchThread.pumpEvents(Unknown Source)
at java.awt.EventDispatchThread.run(Unknown Source)
¿Cuáles son sus parámetros de VM? Intenta aumentar el tamaño del montón. – Viruzzo
Podría agregar el código donde está utilizando la clase StringBuilder. El error es más probable que esté allí. – JustinKSU
Más detalles ayudarían. Dudo que la cadena en la memoria te esté quedando sin memoria. ¿Tienes la stacktrace? –