Help, Can't compile !
I can compile simple classes that do not have objects of my own classes in them, however when I create my own classes and use them as objects the compiler fails to recognize these classes exist in the same directory giving me that "class blahblah not found". This is true even when using an API that asks for the source directory. My other computer works fine, and this one is set up the same with the exception that this one has two OS on it(Win 2000 & WinME).
Any ideas or thoughts?
What is the value of your classpath, then?
All I know that when seeing a problem like that the fundamental cause has always been a wrong class path...
So if you place these two classes in the same directory, in different source files, and then compile from that directory with "javac -classpath . One.java", you get an error message? What is it like?
public class One {
Two t;
public class Two {
}
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Hi. I am very new to JAVA. (I just downloaded the compiler last night.)
I really need help. It seems anything that is suposed to be an applet, I can't compile. I can't even compile the example applet for the "Hello World!" program in the "First Cup of Java" section!!!
I've followed the instructions as I'm told, and keep getting this:
Exception in thread "main" java.lang.NoClassDefFoundError: com/sun/tools/javac/Main
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~BewilderedHi - I just learning Java and think I can help (at least i'll try).
Save all you work on your desktop:
Start Notepad
type the following:
Programmer: Type Your Name
Date: Type whatever date it is
Program: Simply Type the item in between brackets, without brackets: (Test1)
import java.applet.*;
import java.awt.*;
public class Test1Applet extends Applet
public void paint(Graphics g)
g.drawString("I hope I get an applet on my screen!",15, 30);
...And Save As: Test1Applet.java - MAKE SURE YOUR ON YOUR DESKTOP
Then go to File, New (Still using the Notepad application).
Type:
<Applet Code = "Test1Applet.java" Width = 400 Height = 200>
</Applet>
Then Save As: Test1Applet.html - MAKE SURE YOUR ON YOUR DESKTOP
Finally go to the console mode... otherwise known as the Command Prompt. You can go to Start Button on the statusbar click on "Run", type cmd and hit enter.
Once there you need to type: path = OK...At this time you must locate the complete path/drive where you downloaded the Java packages. Once you locate the entire drive (exam: c:\jbuilder3\java\bin) you must type in: path = drive you put the jbuilder,etc, etc in and hit enter.
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HC3096: Warning: topic #1 of vmmi_online help.rtf :
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HC3096: Warning: topic #1 of vmmi_online help.rtf :
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than 31 characters.
HC3096: Warning: topic #1 of vmmi_online help.rtf :
The font name "Franklin Gothic Medium Cond Baltic" is longer
than 31 characters.
HC3096: Warning: topic #1 of vmmi_online help.rtf :
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HC3096: Warning: topic #1 of vmmi_online help.rtf :
The font name "Gill Sans Ultra Bold Condensed CE" is longer
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I assume these are why i can't compile... I don't find these
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when I compiled this same file.
Thanks,
kbToday, I discovered that creating a whole new RH for Word
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I've had a similiar problem with decompiling certain
classes. Try the following decompiler,
http://jrevpro.sourceforge.net, after using this one,
the code decompiled fine, this tool is also a
disassembler and quite a nifty one i might add. :)
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Can't compile with QT4 anymore
Hi,
Since last upgrade I can't compile my qt4 apps with KDevelop or QDevelop. It says something like :
make: *** No rules to build target « /opt/qt4/mkspecs/linux-g++/qmake.conf », required by « Makefile ». Stopping.
The qt-config tool does not exist anymore. There is a qtconfig one but, doesn't seem to be helping.
I know that the files in the the qt4 package have been moved from /opt/qt4 to /usr/, but still I don't know what to do.
I'm stuck !The fact is I cannot compile ANYTHING in QT4 !
Let's take an example. I want to compile QPaddy (you can find it on qt-apps.org).
I set the vars (which doesn't seem to have any effect):
export QTDIR=/usr/share/qt4
export QMAKESPEC=/usr/share/qt4/mkspecs/linux-g++
export QT_LIBRARY_PATH=/usr/include/Qt
I try to compile QPAddy :
qmake qpaddy.pro
make
Here is what I get :
cd src/ && make -f Makefile
make[1]: entrant dans le répertoire « /root/docs/qpaddy0876/src »
make[1]: *** Pas de règle pour fabriquer la cible « /usr/lib/qt-3.3/mkspecs/default/qmake.conf », nécessaire pour « Makefile ». Arrêt.
make[1]: quittant le répertoire « /root/docs/qpaddy0876/src »
make: *** [sub-src-make_default] Erreur 2
And now the MakeFile :
# Makefile for building: qpaddy
# Generated by qmake (2.01a) (Qt 4.3.2) on: mar. nov. 6 17:49:17 2007
# Project: qpaddy.pro
# Template: subdirs
# Command: /usr/bin/qmake -unix -o Makefile qpaddy.pro
first: make_default
MAKEFILE = Makefile
QMAKE = /usr/bin/qmake
DEL_FILE = rm -f
CHK_DIR_EXISTS= test -d
MKDIR = mkdir -p
COPY = cp -f
COPY_FILE = $(COPY)
COPY_DIR = $(COPY) -r
INSTALL_FILE = install -m 644 -p
INSTALL_PROGRAM = install -m 755 -p
INSTALL_DIR = $(COPY_DIR)
DEL_FILE = rm -f
SYMLINK = ln -sf
DEL_DIR = rmdir
MOVE = mv -f
CHK_DIR_EXISTS= test -d
MKDIR = mkdir -p
SUBTARGETS = \
sub-src
src//$(MAKEFILE):
@$(CHK_DIR_EXISTS) src/ || $(MKDIR) src/
cd src/ && $(QMAKE) src.pro -unix -o $(MAKEFILE)
sub-src-qmake_all: FORCE
@$(CHK_DIR_EXISTS) src/ || $(MKDIR) src/
cd src/ && $(QMAKE) src.pro -unix -o $(MAKEFILE)
sub-src: src//$(MAKEFILE) FORCE
cd src/ && $(MAKE) -f $(MAKEFILE)
sub-src-make_default: src//$(MAKEFILE) FORCE
cd src/ && $(MAKE) -f $(MAKEFILE)
sub-src-make_first: src//$(MAKEFILE) FORCE
cd src/ && $(MAKE) -f $(MAKEFILE) first
sub-src-all: src//$(MAKEFILE) FORCE
cd src/ && $(MAKE) -f $(MAKEFILE) all
sub-src-clean: src//$(MAKEFILE) FORCE
cd src/ && $(MAKE) -f $(MAKEFILE) clean
sub-src-distclean: src//$(MAKEFILE) FORCE
cd src/ && $(MAKE) -f $(MAKEFILE) distclean
sub-src-install_subtargets: src//$(MAKEFILE) FORCE
cd src/ && $(MAKE) -f $(MAKEFILE) install
sub-src-uninstall_subtargets: src//$(MAKEFILE) FORCE
cd src/ && $(MAKE) -f $(MAKEFILE) uninstall
Makefile: qpaddy.pro /usr/share/qt4/mkspecs/linux-g++/qmake.conf /usr/share/qt4/mkspecs/common/g++.conf \
/usr/share/qt4/mkspecs/common/unix.conf \
/usr/share/qt4/mkspecs/common/linux.conf \
/usr/share/qt4/mkspecs/qconfig.pri \
/usr/share/qt4/mkspecs/features/qt_functions.prf \
/usr/share/qt4/mkspecs/features/qt_config.prf \
/usr/share/qt4/mkspecs/features/exclusive_builds.prf \
/usr/share/qt4/mkspecs/features/default_pre.prf \
/usr/share/qt4/mkspecs/features/release.prf \
/usr/share/qt4/mkspecs/features/default_post.prf \
/usr/share/qt4/mkspecs/features/qt.prf \
/usr/share/qt4/mkspecs/features/unix/thread.prf \
/usr/share/qt4/mkspecs/features/moc.prf \
/usr/share/qt4/mkspecs/features/warn_on.prf \
/usr/share/qt4/mkspecs/features/resources.prf \
/usr/share/qt4/mkspecs/features/uic.prf \
/usr/share/qt4/mkspecs/features/yacc.prf \
/usr/share/qt4/mkspecs/features/lex.prf
$(QMAKE) -unix -o Makefile qpaddy.pro
/usr/share/qt4/mkspecs/common/g++.conf:
/usr/share/qt4/mkspecs/common/unix.conf:
/usr/share/qt4/mkspecs/common/linux.conf:
/usr/share/qt4/mkspecs/qconfig.pri:
/usr/share/qt4/mkspecs/features/qt_functions.prf:
/usr/share/qt4/mkspecs/features/qt_config.prf:
/usr/share/qt4/mkspecs/features/exclusive_builds.prf:
/usr/share/qt4/mkspecs/features/default_pre.prf:
/usr/share/qt4/mkspecs/features/release.prf:
/usr/share/qt4/mkspecs/features/default_post.prf:
/usr/share/qt4/mkspecs/features/qt.prf:
/usr/share/qt4/mkspecs/features/unix/thread.prf:
/usr/share/qt4/mkspecs/features/moc.prf:
/usr/share/qt4/mkspecs/features/warn_on.prf:
/usr/share/qt4/mkspecs/features/resources.prf:
/usr/share/qt4/mkspecs/features/uic.prf:
/usr/share/qt4/mkspecs/features/yacc.prf:
/usr/share/qt4/mkspecs/features/lex.prf:
qmake: qmake_all FORCE
@$(QMAKE) -unix -o Makefile qpaddy.pro
qmake_all: sub-src-qmake_all FORCE
make_default: sub-src-make_default FORCE
make_first: sub-src-make_first FORCE
all: sub-src-all FORCE
clean: sub-src-clean FORCE
distclean: sub-src-distclean FORCE
-$(DEL_FILE) Makefile
install_subtargets: sub-src-install_subtargets FORCE
uninstall_subtargets: sub-src-uninstall_subtargets FORCE
mocclean: compiler_moc_header_clean compiler_moc_source_clean
mocables: compiler_moc_header_make_all compiler_moc_source_make_all
install: install_subtargets FORCE
uninstall: uninstall_subtargets FORCE
FORCE:
Any idea ? -
Hy,
I need your help, I cannot compile my programms. I installed jdk1.3.1_01 and set the path (c:\jdk1.3.1_01\bin) but it doesn't work. I don't know why. Can you please help me?so your shell is probably just picking up a java command from the WINDOWS directory. Try to execute java -version. I assume this will not be the version you have installed. It's probably just your PATH. You can see its current setting by typing either just SET for the whole environment or echo %PATH% for just your PATH.
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Can's compile the gdbm program ?(SOLVED)
Here is an example comes from Beginning Linux Programming 3rd ,and I can't compile it on my machine. I don't know why?? And the gdbm package is always in the base. Please help me.
try compile 1：
$gcc dbm1.c -o gdbm1 -lgdbm
错误信息：
/tmp/cc2vMknU.o: In function `main':
dbm1.c: (.text+0x2d): undefined reference to `dbm_open'
dbm1.c: (.text+0x244): undefined reference to `dbm_store'
dbm1.c: (.text+0x2ee): undefined reference to `dbm_fetch'
dbm1.c: (.text+0x379): undefined reference to `dbm_close'
collect2: ld returned 1 exit status
try compile 2：
$ gcc dbm1.c -o gdbm1 -lndbm -L/usr/lib
错误信息：
/usr/bin/ld: cannot find -lndbm
collect2: ld returned 1 exit status
#include <unistd.h>
#include <stdlib.h>
#include <stdio.h>
#include <fcntl.h>
#include <ndbm.h>
#include <string.h>
#define TEST_DB_FILE "/tmp/dbm1_test"
#define ITEMS_USED 3
/* A struct to use to test dbm */
struct test_data {
char misc_chars[15];
int any_integer;
char more_chars[21];
int main() {
struct test_data items_to_store[ITEMS_USED];
struct test_data item_retrieved;
char key_to_use[20];
int i, result;
datum key_datum;
datum data_datum;
DBM *dbm_ptr;
dbm_ptr = dbm_open(TEST_DB_FILE, O_RDWR | O_CREAT, 0666);
if (!dbm_ptr) {
fprintf(stderr, "Failed to open database\n");
exit(EXIT_FAILURE);
/* put some data in the structures */
memset(items_to_store, '\0', sizeof(items_to_store));
strcpy(items_to_store[0].misc_chars, "First!");
items_to_store[0].any_integer = 47;
strcpy(items_to_store[0].more_chars, "foo");
strcpy(items_to_store[1].misc_chars, "bar");
items_to_store[1].any_integer = 13;
strcpy(items_to_store[1].more_chars, "unlucky?");
strcpy(items_to_store[2].misc_chars, "Third");
items_to_store[2].any_integer = 3;
strcpy(items_to_store[2].more_chars, "baz");
for (i = 0; i < ITEMS_USED; i++) {
/* build a key to use */
sprintf(key_to_use, "%c%c%d",
items_to_store[i].misc_chars[0],
items_to_store[i].more_chars[0],
items_to_store[i].any_integer);
/* build the key datum strcture */
key_datum.dptr = (void *)key_to_use;
key_datum.dsize = strlen(key_to_use);
data_datum.dptr = (void *)&items_to_store[i];
data_datum.dsize = sizeof(struct test_data);
result = dbm_store(dbm_ptr, key_datum, data_datum, DBM_REPLACE);
if (result != 0) {
fprintf(stderr, "dbm_store failed on key %s\n", key_to_use);
exit(2);
} /* for */
/* now try and retrieve some data */
sprintf(key_to_use, "bu%d", 13); /* this is the key for the second item */
key_datum.dptr = key_to_use;
key_datum.dsize = strlen(key_to_use);
data_datum = dbm_fetch(dbm_ptr, key_datum);
if (data_datum.dptr) {
printf("Data retrieved\n");
memcpy(&item_retrieved, data_datum.dptr, data_datum.dsize);
printf("Retrieved item - %s %d %s\n",
item_retrieved.misc_chars,
item_retrieved.any_integer,
item_retrieved.more_chars);
else {
printf("No data found for key %s\n", key_to_use);
dbm_close(dbm_ptr);
exit(EXIT_SUCCESS);
Last edited by 009lin (2007-08-19 02:29:54)GDBM includes dbm and ndbm compatability.
I found the solution from the man page, it said:
If you wish to use the dbm or ndbm compatibility routines, you must
link in the gdbm_compat library as well. For example:
gcc -o prog proc.c -lgdbm -lgdbm_compat
Last edited by 009lin (2007-08-19 02:29:27) -
hi everyone...can you please help me in comliping my package...there's this error that i don't understand...
here is my add_user.jsp where it all begins...
<jsp:useBean id="Users" class="ris.Users"/>
<%
name = (request.getParameter("name") == null) ? "" : request.getParameter("name");
if(request.getParameter("create") != null) {
if(Users.checkReg(name, workgroup_id)) {
%>
<jsp:setProperty name="Users" property="name"/>
<jsp:setProperty name="Users" property="password"/>
<jsp:setProperty name="Users" property="workgroup_id"/>
<jsp:setProperty name="Users" property="dworklist"/>
<jsp:setProperty name="Users" property="dforms"/>
<jsp:setProperty name="Users" property="printer"/>
<%
if(Users.createUser()) {
Users.getUser(name, workgroup_id);
session.setAttribute("user_id", Users.getUserid());
session.setAttribute("workgroup_id", Users.getWorkgroupID());
%>
<%
else {
request.setAttribute("create", "Error - unsuccessful");
else {
request.setAttribute("create", "Error - created");
if(request.getAttribute("create") != null) {
if(request.getAttribute("create").equals("Error - unsuccessful"))
message = "Could not add user. Please try again";
if(request.getAttribute("create").equals("Error - registered"))
message = "The name and user type you selected has been already in created.";
request.removeAttribute("create");
%>
<html>
<body>
<%= message %>
<form action ="add_user.jsp" method ="POST">
Name: <input type = "text" name="name" size=5><br>
Password: <input type = "password" name="password" size=5><br>
Confirm Password: <input type = "password" name="cpassword" size=5><br>
User Type:
<select name="workgroup_id">
<option value="x" selected="Selected">Select User Type</option>
<option value="1">Physician</option>
<option value="2">Scheduler</option>
<option value="3">Clerk</option>
<option value="4">Technologist</option>
<option value="5">Radiologist</option>
<option value="6">Transcriptionist</option>
</select><br>
Default Worklist: <input type = "text" name="dworklist" size=5><br>
Default Forms: <input type = "text" name="dforms" size=5><br>
Printer: <input type = "text" name="printer" size=5><br>
<br>
<br>
<input name="create" type = "submit" value="Submit">
<input type = "reset" value="Clear">
</form>
</body>
</html>and here is my Users.java which i can't compile..
package ris;
import java.sql.*;
import java.util.*;
public class Users {
private int user_id, workgroup_id;
private String name, password, dworklist, dforms, printer;
public int getUserid() {
return user_id;
public void setUserid(int user_id) {
this.user_id = user_id;
public String getName() {
return name;
public void setName(String name) {
this.name = name;
public int getPassword() {
return user_id;
public void setPassword(String password) {
this.password = password;
public int getWorkgroupID() {
return workgroup_id;
public void setWorkgroupID(int workgroup_id) {
this.workgroup_id = workgroup_id;
public String getDWorklist() {
return dworklist;
public void setDWorklist(String dworklist) {
this.dworklist = dworklist;
public String getDForms() {
return dforms;
public void setDForms(String dforms) {
this.dforms = dforms;
public String getPrinter() {
return printer;
public void setPrinter(String printer) {
this.printer = printer;
public boolean checkReg(String name, int workgroup_id) {
String query = "SELECT User_ID FROM users WHERE [Name]='" + name + "' AND [Workgroup_ID]='" + workgroup_id + "'";
try {
String driver = "org.gjt.mm.mysql.Driver";
Class.forName(driver).newInstance();
String url="jdbc:mysql://localhost/ris?user=root&password=restricted";
Connection con=DriverManager.getConnection(url);
Statement stat = con.createStatement();
ResultSet rst = stat.executeQuery(query);
if(rst.next() == false) {
con.close();
return true;
else {
con.close();
return false;
catch(Exception e) {
e.printStackTrace();
return false;
public boolean createUser() {
user_id = (int) (1000 + Math.random()* 1000);
dworklist = "";
workgroup_id = (int)
name = "";
password = "";
dforms = "";
printer = "";
String query = "INSERT INTO users (User_ID, [Name], [Password], [Workgroup_ID], [Default_Worklist], [Default_Forms], [Printer_Assignment]) " +
"VALUES (" + user_id + ", " +
"'" + name + "', " +
"'" + password + "', " +
"'" + workgroup_id + "', " +
"'" + dworklist + "', " +
"'" + dforms + "', " +
"'" + printer + "')";
try {
String driver = "org.gjt.mm.mysql.Driver";
Class.forName(driver).newInstance();
String url="jdbc:mysql://localhost/ris?user=root&password=restricted";
Connection con=DriverManager.getConnection(url);
Statement stat = con.createStatement();
stat.execute(query);
con.close();
return true;
catch(Exception e) {
e.printStackTrace();
return false;
public boolean getUser(String name, int workgroup_id) {
String query = "SELECT * FROM users WHERE [Name]='" + name + "' AND [Workgroup_ID]='" + workgroup_id + "'";
try {
String driver = "org.gjt.mm.mysql.Driver";
Class.forName(driver).newInstance();
String url="jdbc:mysql://localhost/ris?user=root&password=restricted";
Connection con=DriverManager.getConnection(url);
Statement stat = con.createStatement();
ResultSet rst = stat.executeQuery(query);
while(rst.next()) {
user_id = rst.getInt("User_ID");
this.name = rst.getString("Name");
this.workgroup_id = rst.getInt("Workgroup_ID");
dworklist = rst.getString("Default_Worklist");
dforms = rst.getString("Default_Forms");
printer = rst.getString("Printer_Assignment");
con.close();
return true;
catch(Exception e) {
e.printStackTrace();
return false;
}and here is my problem, when i try to compile my Users.java this error shows up...
Users.java:96: inconvertible types
found : java.lang.String
required: int
name = "";
^
please help me with this...any help would be greatly appreciated...thanks in advance...Ok, I reinstalled jboss with the EJB 3.0 option and now it works
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