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Java Error Meanings


You need to compile the source program (".java") to get the class file (".class"). 2) If the Java class is present in the current directory, issue a "set classpath" command to POSSIBLE SOLUTIONS: 1. That documentation contains more detailed, developer-targeted descriptions, with conceptual overviews, definitions of terms, workarounds, and working code examples. Read "Step 6(a) Install Servlet API Library" again, again and again.... http://shpsoftware.com/java-error/java-error-exception-in-thread-main-java-lang-noclassdeffounderror.php

SYMPTOM: Can compile the JDBC program but Runtime Error ERROR MESSAGE: com.mysql.jdbc.exceptions.jdbc4.MySQLSyntaxErrorException: Unknown database 'xxxx' PROBABLE CAUSES: DriverManager.getConnection("jdbc:mysql://localhost:8888/xxxx", user, password) specifies a database that does not exist in the server. Define environment variable JAVA_HOME according to "Step 2: Create an Environment Variable JAVA_HOME". And I am getting an error in the compiler saying expected class if. Check your classpath to make sure that it contains the .class file that you need.

Java Runtime Errors List

Alternatively, you can create a User library and specifying the native library (Refer to "Eclipse How-To") For NetBeans, the VM command-line option can be set in "Set Configuration" ⇒ "Customize..." ⇒ Suppose you installed the JDK in /usr/local/jdk1.8.0. but the error referred to the line with class (earlier in the code) instead. Treating a static method as if it were an instance method Static methods are associated with messages sent to classes rather than objects.

  1. For instance, if you're trying to run a program named MyGreatProg, look for a file named MyGreatProg.class in your working directory.
  2. PROBABLE CAUSES: The method ResultSet.getXxx(columnName) cannot locate the requested columnName in the ResultSet.
  3. Why was the identity of the Half-Blood Prince important to the story?
  4. Check "my.ini", make sure that you have a [client] section with port=xxxx. 3.

PROBABLE CAUSES: Syntax error in the SQL statement. Missing class brackets A common bracketing error that you will often make is to omit the final } bracket that delimits the end of a class. POSSIBLE SOLUTIONS: Check that "datadir" selects the "data" sub-directory of your MySQL installed directory, e.g., datadir=d:/myproject/mysql/data SYMPTOM: MySQL Server runs on TCP port 3306 (the MySQL default port number) instead of Common Errors In Java Programming POSSIBLE SOLUTIONS: There seems to be a bug in JDK 1.7 u2 onwards, that affects only some computers.

If you still have problems, you might have to change your CLASSPATH variable. Java Error Expected POSSIBLE SOLUTION: Create the database using a client, before running the Java program. But first, ask yourself why this variable's declaration isn't inside the main method. Thanks –Tarrant Aug 17 '11 at 21:44 @Tarrant No reason to feel dumb!

The "java.library.path" usually mirrors the Envrionment Variable PATH. Java Syntax Errors When you find more than one statement between an if and its else, look for curly braces. To see if this is necessary, try clobbering the classpath with the following command. POSSIBLE SOLUTIONS: Shutdown the previously-started MySQL.

Java Error Expected

The only way that you can access such instance variables is through methods which are declared in the class in which the instance variables are defined. Assume that this method is involved in sending a message to an object destination. Java Runtime Errors List Accessing Tomcat Server Common Error Messages: (Firefox) Unable to Connect; (IE) Internet Explorer cannot display the webpage; (Chrome) Oops! Java Errors And Solutions Parameters:message - the detail message (which is saved for later retrieval by the Throwable.getMessage() method).cause - the cause (which is saved for later retrieval by the Throwable.getCause() method). (A null value

PROBABLE CAUSES: No such Data Source (ODBC) name in method DriverManager.getConnection("jdbc:odbc:ODBCName"); POSSIBLE SOLUTION: Check your ODBC configuration (under control panel ⇒ ODBC). http://shpsoftware.com/java-error/java-error-cannot-be-cast-to-java-applet-applet.php A common mistake is to write this as: int newVal = tryIt(destination, arg1,arg2) This gives rise to error messages of the form: Line nn: ')' expected Assuming that == stands for The compiler will issue an error message such as: Line nn: class or interface declaration expected when, for example, you capitalise the keyword class. A common error is to have a new line embedded in the string. Java Error Codes List

POSSIBLE SOLUTIONS: 1) Issue a "dir" command to list the contents of the current directory. MySQL Installation Common Errors Starting the MySQL Server after Installation First of all, check if you have already started an instance of MySQL Server: For Windows, start the "Task Manager", select asked 6 years ago viewed 9584 times active 4 years ago Blog Stack Overflow Podcast #91 - Can You Stump Nick Craver? navigate to this website You can see the complete list of 300 odd Java error messages in file lib/tools.jar in member sun/tools/javac/resources/javac.properties.

The solution is to use the this keyword. Identifier Expected Error In Java Look at all the lines between an if and its else. Using the "mysql" Client ERROR MESSAGE: ERROR 1046 (3D000): No database selected PROBABLE CAUSES: The default database is not set POSSIBLE SOLUTIONS: 1) Issue command "use database" to set the default

Most of the time the other errors will disappear.

Note that the detail message associated with cause is not automatically incorporated in this error's detail message. Remove servlet-api.jar from JDK's extension directory if any. Bugs There are also outright bugs in the various Java compilers and runtimes. List Of Java Exceptions Un-install JDK and JRE (via control panel ⇒ "Program and Features"...) 2.

NoClassDefFoundError You get this error when you're trying to run your code. at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method) at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:57) at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45) at java.lang.reflect.Constructor.newInstance(Constructor.java:525) at com.mysql.jdbc.Util.handleNewInstance(Util.java:411) at com.mysql.jdbc.SQLError.createCommunicationsException(SQLError.java:1116) at com.mysql.jdbc.MysqlIO.(MysqlIO.java:344) at com.mysql.jdbc.ConnectionImpl.coreConnect(ConnectionImpl.java:2333) at com.mysql.jdbc.ConnectionImpl.connectOneTryOnly(ConnectionImpl.java:2370) at com.mysql.jdbc.ConnectionImpl.createNewIO(ConnectionImpl.java:2154) at com.mysql.jdbc.ConnectionImpl.(ConnectionImpl.java:792) at com.mysql.jdbc.JDBC4Connection.(JDBC4Connection.java:47) at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method) at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:57) at To change your directory, type the following command at the prompt and press Return: cd /home/jdoe/java If you enter pwd at the prompt, you should see /home/jdoe/java. my review here share|improve this answer answered Aug 17 '11 at 21:39 Eng.Fouad 67.6k40189295 add a comment| up vote 0 down vote You can't name your class if, as it's a keyword.

count++ ^ testing.java:14: Invalid declaration. Note down the server's port number from the server's console. 2. MySQL Server is NOT started, or 2. Kill it.

Give us your feedback. This will be flagged as an error and will generate an error message of the form: Line nn: Method xxxx not found in yyyy where xxxx is the name of the where xxxx is the name of the class which has not been given the correct capitalisation. C++ with GCC Compiler SYMPTOM: Cannot compile ERROR MESSAGE: error: 'string' does not name a type CAUSES/SOLUTION: missing "using namespace std;" SYMPTOM: Cannot compile ERROR MESSAGE: error: iostream: No such file

Your cache administrator is webmaster. If the program works now, you'll have to change your CLASSPATH variable. If things were running fine until the lightning strikes, ask yourself what have you CHANGED!

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