JDBC By Using Properties Objects Show Password In Heap

May 4, 2015

Properties info = new Properties( );
info.put( "user", "username" );
info.put( "password", "password" );

Connection conn = DriverManager.getConnection(URL, info);

I am using simple jdbc connection to connect to Sybase as shown above , problem is security team is able to see password as clear text in heap, How to avoid it.

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JavaFX 2.0 :: Objects Don't Free Heap Memory

Apr 9, 2014

I have a simple JavaFX Application that open a Browser and shows google page. After exit the Application and free all objects, I can see that the JavaFX objects like Scene, Stage, WebView and WebEngine are alive in the heap memory after call GC. I can see this objects with JProfiler and other Profiler tools.

This is my Test code:
import java.awt.FlowLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import javafx.application.Application;
import javafx.application.Platform;

[Code] .....

And my JavaFX Application:

import javafx.application.Application;
import javafx.geometry.HPos;
import javafx.geometry.VPos;
import javafx.scene.Scene;
import javafx.scene.layout.Region;import javafx.scene.paint.Color;

[Code] .....

To test the application click on Start Button to show google web page, click on Stop Button to stop the application, run a Profiler tool, and call gc, the JavaFX classes are alive. I am using java version "1.7.0_51" and windows 8.1 Is there something wrong in my code? Or this is the normal behavior?

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JDBC :: Options Required For DB Schema Password Encryption - Connecting To Backend Database

Jul 9, 2015

We currently have an application which uses JDBC to connect to the backend database (DB version - 11.2.0.3 ). The application uses a properties file in which the password for the db schema is hardcoded in plain text format. Due to security restrictions we have been asked to make sure the password is encrypted in the file and no direct access is made to the schema using the plain text password. Best options we can use to make this password encrypted both at Oracle DB side and Java side.

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Loop Through Objects Of Subclasses To Show Area Of Each?

Oct 13, 2014

This assignment requires me to show areas of each shape by using loop. I can do it with abstract and interface , but in this case. I don't know how to use method getArea() to loop for each object

import java.util.ArrayList;
public class TestShape {
ArrayList<Shape> list = new ArrayList<Shape>();
Circle c;
Rectangle r;
Square s;
public TestShape() {

[Code] .....

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Write A Program That Prompts User To Enter A Password And Displays Valid Password

Dec 3, 2014

My homework is asking me to write a program that prompts the user to enter a password and displays "valid password" if the rule is followed or "invalid password"

Sample
enter a string for password: wewewx
valid password

It's being graded on
Design of my GUI
Dialog box
User friendliness
Creativity

My current issues with the current code I have written is simply the password doesn't work unless it starts with 2 digits, the other order it displays as wrong. and I have no idea how to add a GUI.

import java.util.*;
import java.lang.String;
import java.lang.Character;

[code]....

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JDBC :: How To Call Parameterized Stored Procedure In Jdbc

May 17, 2014

calling a parameterized stored procedure in java jdbc from sql server.The stored procedure goes like this in sql

create proc patientreg
@id int
as
begin
select [patient_id],[Psurname], [pFirstname], [pMiddlename], [reg_date], [DOB], [Sex], [Phone_num], [Addr],[Email],[dbo].[fncomputeage](DOB) from [dbo].[Patient_registration] where [patient_id] = @id
end
please note dbo.fncompute(DOB) is a function

To call it in jdbc it goes like this

try{
String str = "{call patientreg(?)}";
Class.forName("sun.jdbc.odbc.JdbcOdbcDriver");
con = DriverManager.getConnection("jdbcdbc:GeneralHospit al");
cstmt = con.prepareCall(str);
cstmt.setInt(1, Integer.parseInt(t.getText()));

[code]....

after doing it this way it throwing an exception: Error:java.sql.SQLException: Parameter 1 is not an OUTPUT parameter.

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Setting Password And Username - Username Works But Getting Errors For Password?

Apr 4, 2015

username works perfectly, but when I enter password I get this error.

Java Code:

OKbtn.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent evt) {
if(Usernametxt.getText().equals("Admin") &&
(Passwordfld.getPassword().equals("Admin2"))){
System.out.println("permition granted");
}else{
System.out.println("permition Rejected");

[code]....

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Getting Password From Password Field

Aug 26, 2014

I am new to JAVA GUI programming and was wondering how you go about getting and testing if a password field text equals something. For example, if the password equals "password" then do something.

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New Lines Don't Show Up In File But They Do Show Up On Console

Apr 30, 2015

I have the following code.

class A {
List<StringBuilder> list;
public void output(List<StringBuilder> objectToOutput){
try(BufferedWriter bw = new BufferedWriter(new FileWriter("temp.txt"))){
for(StringBuilder row:objectToOutput) bw.write(row.toString());
}catch(IOException e){}

[code]....

Why don't the a's show up on the console? I put them in as part of the debugging process and now I don't understand why they don't show up in both places.

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Array Not Updating As A Heap?

Sep 25, 2014

When I add an element to my array, I have to make sure that it stays a heap, ie every child is smaller than its parent. However the method that I am using for this, trickling up, is not updating the elements properly, it pretty much just leaves is as is.

Here is the relevant code:

public class MaxIntHeap {
int[] array;
int actualSize = 0;
public MaxIntHeap(){
array = new int[20];

[code].....

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Implementing Heap From ArrayList

Nov 25, 2014

in my class is implement a heap and use some of the methods we were provided. The methods I was provided to code and use are "siftDown", "isEmpty" and "heapify". I'm pretty sure the code I have written for "heapify" and "isEmpty" is correct, where I think I am finding fault is the code for my "siftDown". Would you mind taking a look at my code and see why when adding integers to the heap object that I have created in the main code, that they are not being output correctly?

public class Tester {
public static void main(String[] args) {
Heap myHeap = new Heap();
myHeap.insert(9);
myHeap.insert(15);
myHeap.insert(6);
myHeap.insert(4);
myHeap.insert(10);
myHeap.insert(9);
myHeap.insert(3);

[code]....

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Priority Queue Implementation Using Heap / BST

Dec 4, 2014

I am in the process of implementing Priority queue, as I understand that there are many data structures you could use to implement. I implemented it with the an array, which it works absolutely fine. However I have limitations on what collections I can use from the collections classes. I fact I cant use any of the collections classes. Meaning I cant use array.

I’m trying to implement Priority Queue using heap. And implementing heap using binary trees. But however I have a few questions which I need to clarify and I cant think of any other way of resolving it. Ofcourse I can implement my own simple array class using linked list.

Inserting into heap would be quite simple, as I just need to find the right last position from left to right leaf to insert the node into the tree. However after inserting, you may want to make sure that leaf node values are > than root node. Therefore, the root node will always be with the highest priority.

I call these steps where you compare from top down as bubbledown and bubbleup. To do this I really need a for each node within the treee node to have attribute pointing to its root node. So in case of bubbleup I always have a pointer for a given node to its root, without it would mean I would to traverse through the entire tree to identify its root. Which I believe is very inefficient.

Or have I taken this completely wrong? Or is it the case that heap are only best with arrays and therefore use array (by implement it using linked list?)

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Application Hanging But No Heap Exhaustion?

Jul 3, 2014

maximum heap size is set at 1.5GB and consumption of memory at peak load is about 1.1GB. when it reaches 1.1GB, application starts to hang. what could be the problem? shouldn't it be hanging at the point where memory is about equal to the max heap setting? no heap dumps were generated. is this due to server hardware or something? already got the garbage collection data and nothing seemed unusual.

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Using Min-heap To Sort List Of Words

May 5, 2015

I am learning to use heaps and as an exercise I am trying to write a program using a heap class I have created to sort words. I have read in words from a file and added them to the heap successfully. I am having some trouble figuring out how I can print out a sorted list of the words. From my understanding of how a min-heap works, if I remove from the min/root node they will always be removed in sorted order. So far I have tried out to do a simple for loop but, only half of the heap is being removed. Not sure if my logic is incorrect of there is an error somewhere in my removeMin() function specifically in the while loop.

public static void main(String[] args) {
Heap heap = new Heap();
heap = read( heap );
for( int i = 0; i < heap.getSize(); i++){
heap.removeMin();

[Code] ....

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Ratio Of Memory (RAM) To Heap Space?

Nov 10, 2013

What is the ratio of Memory(RAM) to heap space ? ie: When JVM will throw OutOfMemoryError based on heap available to JVM ?

OutofMemoryError - Memory:RAM size

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Increasing Java Heap Size

Nov 21, 2013

I am using a 64 bit Win 7 Pc with 64-bit JVM and we get the error: Java heap space. So we want to increase the Java heap size but not for one application but for every application or in general.

We tried with the java -xmx command but it didn't work...

We tried setting the system variable JAVA_OPTS but again it didn't work...

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Heap Memory Consumed By Solaris JVM

Dec 16, 2013

I have two unix systems in which on one system I installed sun solaris jdk and on another system I installed IBM jdk.
 
Java programs which consume more heap memory are getting failed on sun solaris jdk system where as same programs are successfully getting executed on IBM jdk system .
 
My question is does sun solaris 64 bit jdk needs more heap than IBM 64 bit jdk ??

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How To Increase The Heap Size More Than 1024m

Sep 29, 2014

When I try to write the .xlsx file using apache POI,  XSSFWorkbook API and run this program in Eclipse STS, I am getting the java.lang.OutOfMemoryError: Java heap space error. Then I searched the net and add these -Xms512m -Xmx1024m in the eclipse VM arguments. Even though I am getting the same error. Again i increase heap size but i am getting the different error like "occurred during initialization of VM, Could not reserve enough space for object heap". how to increase the heap size or any other API to read, delete and write the .xlsx file. I am having 4GB ram in my machine. Apache POI is very good for .xls but if it is .xlsx performance wise it is very slow.

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Computing New String - Memory Out Of Heap Error

Sep 28, 2014

Given a string, compute a new string where identical chars that are adjacent in the original string are separated from each other by a "*". My implementation :

package com.tcs.dash;
public class StringBuild {
public String edit(String userIp){
StringBuilder builder = new StringBuilder(userIp);
String replaceText = "";
for(int i = 0; i < builder.length() - 1; i++){
if(builder.charAt(i) == builder.charAt(i+1)){
replaceText = builder.charAt(i) + "*" + builder.charAt(i+1);
builder = builder.replace(i, i+1, replaceText);
}
}
return builder.toString();
}
}

I am getting error at line 13. An exception actually.

I/P given = aaaa

Console:

Exception in thread "main" java.lang.OutOfMemoryError: Java heap space
at java.util.Arrays.copyOf(Unknown Source)
at java.lang.AbstractStringBuilder.expandCapacity(Unknown Source)
at java.lang.AbstractStringBuilder.ensureCapacityInternal(Unknown Source)
at java.lang.AbstractStringBuilder.replace(Unknown Source)
at java.lang.StringBuilder.replace(Unknown Source)
at com.tcs.dash.StringBuild.edit(StringBuild.java:13)
at com.tcs.dash.StringBuildExample.main(StringBuildExample.java:14)

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Applet Out Of Memory Error / How To Increase Available Heap Space

Jul 7, 2014

I was wondering where is the memory allocated for an applet; by the browser; by the JVM; some applet specific java option? I get an out of memory error when running my applet (loading pictures).

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Return Height Of Heap Of Sand In Bottom Of Hourglass

Nov 18, 2014

I am working on program and have been struggling to get around step 5 and 6 given below.

I have got on with the first couple of points. Where to begin with steps 5 and 6.

Java Code:

class Hourglass {
int height;
int bottomHalf;
public Hourglass (int h) {
height =h;
}
public Hourglass (){
height=3;
}

/*Write a method dropGrain that simulates one grain of sand falling into the bottom half of the Hourglass. If all the sand is already at the bottom before a grain is dropped, this method should cause the hourglass to be flipped, meaning that all the sand will be in the top again. Then, one grain of sand should fall. */

//Hint: this method can be quite short. All you need to do is update one attribute.

public void dropGrain(){
}

/*Write a method getHeapHeight() which returns the height of the heap of sand in the bottom of the hourglass.

Hint: a triangle of height h contains h*h grains (=1+3+5+...+h).

So determining the height when the amount of sand in the bottom half is a square (1,4,9,16,...) is easy. Think about what happens if the amount of sand is not exactly a square.*/

public int getHeapHeight() {
} mh_sh_highlight_all('java');

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Facing OutOfMemory Java Heap Space Error

Jun 21, 2014

I am not a java developer, but I am using a java code that was available online to convert a large XML file to CSV file. The input file size is big, it is around 3GB. I got an error that it is out of memory, it is expectedly due to the large input file that i am trying to convert. Splitting of this file is not possible,

This is what I ran : xml2csv-conv data.xml data.csv

Error:

Exception in thread "main" java.lang.OutOfMemoryError: Java heap space
at com.sun.org.apache.xerces.internal.dom.DeferredDoc umentImpl.createChunk(Unknown Source)
at com.sun.org.apache.xerces.internal.dom.DeferredDoc umentImpl.ensureCapacity(Unknown Source)
at com.sun.org.apache.xerces.internal.dom.DeferredDoc umentImpl.createNode(Unknown Source)
at com.sun.org.apache.xerces.internal.dom.DeferredDoc umentImpl.createDeferredTextNode(Unknown Source)
at com.sun.org.apache.xerces.internal.parsers.Abstrac tDOMParser.character

[code]....

Additional information: I am running this from a Windows8 64 bit machine with 8GB physical RAM.

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Java Heap Memory Error While Writing Large Data To Excel

Mar 6, 2014

i have to write more than 100000 rows in a excel sheet (file size more than 20 MB) via java.

when i use XSSF, i am getting below Error.

java.lang.OutOfMemoryError: Java heap space
at org.apache.xmlbeans.impl.store.Saver$TextSaver.resize(Saver.java:1592)
at org.apache.xmlbeans.impl.store.Saver$TextSaver.preEmit(Saver.java:1223)
at org.apache.xmlbeans.impl.store.Saver$TextSaver.emit(Saver.java:1144)

[Code]....

when i use HSSF , i am getting the below Error.
java.lang.OutOfMemoryError: Java heap space

I have tried increasing the java heap size , by giving upto -Xms1500m -Xmx2048m

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Make Date Column Show Only Date And TimeIn And TimeOut Column Only Show Time

Mar 11, 2014

How do i make the 'date' column show only the date and 'timeIn' and 'timeOut' column only show the time. In my database table my 'date' column is a date type and 'timeIn' and 'timeOut' column is time.

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Heap Dump Generated With Read-write Permissions For Java Process Owner

Apr 14, 2014

I have a question regarding the permissions set for generated heap dumps.
 
I have some Jetty servers running on Linux (Java 6 64 bit / Java 7 64 bit) with the following Java arguments:
 
-XX:+HeapDumpOnOutOfMemoryError
-XX:HeapDumpPath=/opt/apps/heapdump
 
When there is a out-of-memory exception a heap dump is automatically generated by the JVM. But it seems that the heap dump permisions are set to read-write for owner only (600).

When I create files then they have by default read-write for owner and group/all read access (644).
 
$ ls -l
total 795432
-rw------- 1 bamboop bamboo 811322265 Apr 14 09:18 java_pid337.hprof
-rw-r--r-- 1 bamboop bamboo         6 Apr 14 12:57 test
 
Here the umask set for the server running the Java processes
 
$ umask 
0022

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Java File Along With Properties?

May 25, 2015

Need to know how i can store a value in File which is in Properties?

Here I am placing my Properties code :

ReportHTML C:/bea/user_projects/domains/OICDomain/applications/IIMS/IIMS/target/source/REPORT_HTML_DUMP/
ReportEXCEL C:/bea/user_projects/domains/OICDomain/applications/IIMS/IIMS/target/source/REPORT_EXCEL_DUMP/

My Java File :

File destHtmlFolder = new File("C:/bea/user_projects/domains/OICDomain/DOC_SERVER/REPORT_HTML_DUMP");
File srcExcelFolder = new File("C:/bea/user_projects/domains/OICDomain/applications/IIMS/IIMS/target/source/REPORT_EXCEL_DUMP");

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