Comments on: OCP 8 Book Bonus: Creating a Derby Database in Java 8

By: Jeanne Boyarsky

Jeanne Boyarsky — Sat, 25 Aug 2018 17:45:30 +0000

In reply to Filip.

Can post this at https://coderanch.com/f/33/java? CodeRanch is a big Java forum so you’d get people looking at it quickly. (It’s hard to answer long questions in the comments of a blog)

By: Filip

Filip — Tue, 21 Aug 2018 10:00:51 +0000

I typed the code for setting up Derby database. As I tried to compile the code I got the following error:

An exception has occurred in the compiler (1.8.0_161). Please file a bug against the Java compiler via the Java bug reporting page (http://bugreport.java.com) after checking the Bug Database (http://bugs.java.com) for duplicates. Include your program and the following diagnostic in your report. Thank you.
java.lang.NoClassDefFoundError: com/sun/tools/javac/comp/CompileStates$CompileState
at com.sun.tools.javac.main.JavaCompiler.(JavaCompiler.java:428)
at com.sun.tools.javac.main.JavaCompiler.instance(JavaCompiler.java:88)
at com.sun.tools.javac.main.Main.compile(Main.java:485)
at com.sun.tools.javac.main.Main.compile(Main.java:381)
at com.sun.tools.javac.main.Main.compile(Main.java:370)
at com.sun.tools.javac.main.Main.compile(Main.java:361)
at com.sun.tools.javac.Main.compile(Main.java:56)
at com.sun.tools.javac.Main.main(Main.java:42)
Caused by: java.lang.ClassNotFoundException: com.sun.tools.javac.comp.CompileStates$CompileState
at java.net.URLClassLoader.findClass(URLClassLoader.java:381)
at java.lang.ClassLoader.loadClass(ClassLoader.java:424)
at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:338)
at java.lang.ClassLoader.loadClass(ClassLoader.java:357)
… 8 more

…….So my java file did not get compiled. But not only that also my other .java files (simple practice programs) which used to compile fine , are now not compiling and are causing the same error.
Sorry for this verbose comment but I am trying to solve this. Everything I found on the net so far was not very helpful.
Please for some helpful advices!!! Thanks

By: Jeanne Boyarsky

Jeanne Boyarsky — Sat, 19 Aug 2017 16:35:44 +0000

Note: these instructions assume you are using JDK 8 since this is for the Java 8 exam. We do not recommend studying for the Java 8 exam using Java 9. Among other things, Derby is not packaged with the JDK in Java 9)

By: Joel Fuhrmann

Joel Fuhrmann — Tue, 01 Aug 2017 22:11:52 +0000

I got an exception related to the DECIMAL(1,1), and I looked it up on Stack Overflow and the post there said the first digit has to contain the total number of digits in the number, and the second digit contains the number after the decimal poiint. So to store a number like 7.5, the DECIMAL statement should be changed to DECIMAL(2,1). So I ran it like that and it ran with no exceptions.

By: Jeanne Boyarsky

Jeanne Boyarsky — Sun, 02 Jul 2017 12:10:57 +0000

Changed decimal to decimal(1,1) per https://coderanch.com/t/681668/certification/Mistake-OCP-Java-SE-Programmer

By: Antonio

Antonio — Fri, 26 May 2017 09:52:39 +0000

if someone is interested to know how it works with Eclipse-Mars on MAC: right-click in Eclipse on the src folder containing SetupDerbyDatabase file, then click on “Build path”>”Configure Build Path…”, select “Libraries” and click on “Add External JARs…”, search for derby.jar in your jdk library and apply.

By: Jeanne Boyarsky

Jeanne Boyarsky — Sun, 14 May 2017 00:17:31 +0000

In reply to Tahir Abdullayev. I just added it to the errata page. The reason I saw a distinction was that the book directs to the "bonus" blog post for updates. (The bonus page existed before this errata was known. We anticipated changes in db setup). So I thought people might look there already. But you are correct. That's a philosophical point.

By: Tahir Abdullayev

Tahir Abdullayev — Sat, 13 May 2017 08:36:24 +0000

It’s in the ‘bonus’ link, not errata.
How often would people look for ‘bonus’ if they found an error in the book?
Not me, anyway. I was always checking list of errors in the book because I found many, but I didn’t find anything for this error and moved to google to find what the problem is.
Also, why do you need a numbered list of errors in the book if you describe some errors somewhere else and call it not errors, but ‘bonus’?

By: Jeanne Boyarsky

Jeanne Boyarsky — Sat, 13 May 2017 01:59:13 +0000

In reply to Tahir Abdullayev. Note: this post is linked from the errata page.

By: Tahir Abdullayev

Tahir Abdullayev — Thu, 11 May 2017 10:48:36 +0000

The code in the book doesn’t work. The seconds are not included in timestamp and because of this Java gives exception while running the code. I think this should be included in errata list. I’ve spent 1 hour trying to figure out what’s wrong with this code. I’ve found this page after already solving it myself.