#354 Fatal error: Unable to find package java.lang in classpath or bootclasspath
I am a student learning about coding for my degree with little to no previous experience, and am admittedly very overwhelmed and confused. I am working on an assignment, and keep receiving the following fatal error: "Fatal Error: Unable to find package java.lang in classpath or bootclasspath " This occurs after I compile, and the compiler says everything compiled successfully, but when I attempt to run it, it says the interaction pane isn't in sync and I need to recompile. Further, if I look at the console, I see the above fatal error. I am completely at a loss as to how to resolve it. I'd appreciate any help I can get.
DrJava Version : drjava-20190813-220051
DrJava Build Time: 20190813-220051
DrJava Configuration File: /Users/timothyharris/.drjava
I have downloaded and installed JDK12.
Thanks in advance.
I have read somewhere that JDK 1.8 was needed, but I do not remember where. Perhaps it meant minimum? In any event, and realizing that my similar issue was on Linux, you still might go see my comments at Support requests #360/#359 presuming moderators accept them. In my response I detail that in one case, I had to go to Preferences and set the tools.jar location by browsing to it... not just by pasting in the path. I struggled with the symptoms you describe too. In the end, all I had to do was point DrJava to the tools.jar, whether by the preferences, or making sure it was actually installed.
I think this is where I saw someone fixed an issue by using 1.8:
https://stackoverflow.com/questions/57717862/how-to-resolve-unable-to-find-package-java-lang-in-classpath-or-bootclasspath
Last edit: Kevin R. Bulgrien 2020-05-30
DrJava only works with Java JDK 8 which is available for all major laptop
platforms at https://aws.amazon.com/corretto/ (Amazon Corretto) by clicking
on the "Amazon Corretto 8" button. You should uninstall JDK12 (from
Oracle?) first.
Sometime within the next year, I hope to release a version of DrJava that
works for Java JDK 9+. Starting with JDK 9, Oracle broke backward
compatibility for Java apps that use any of the the "lib" files in the JDK
distribution. Eclipse and IntelliJ have massive staffs funded by paid
license revenue or corporate sponsorship, enabling those environments to
support Java 9 and its sucessors as soon as they were released.. DrJava is
nearly 20 years old. In the early days, it was partially supported by
grants from the National Science Foundation, the State of Texas, and Sun
Microsystems and it kept abreast of the latest technology including`support
for generic types (as in Java 5) and integrated unit testing (using JUnit)
from its inception in 2001. But now the only support for DrJava is a small
fraction of my (donated) time. For a beginning programmer, the differences
between Java 8 and Java 12 are insignificant, but the Java 12 distribution
(most importantly library files) is inconsistent with the Java 8
distribution. Amazon still supports Java 8 because many applications like
DrJava still rely on that environment. In the progression from Java 1 to
Java 8, each new version of Java augmented the previous one but supported a
high level of backward compatibility. (I have not tried it, but I think
all of the older versions of DrJava will run on Java JDK 8. I am not aware
of any incompatibilities.) In contrast, none of the released versions of
DrJava released since 2001 will run on Java JDK 9, 10, 11, 12, 13, 14, ...
Roll back to Java JDK 8 and enjoy ...
Best,
Corky
On Tue, Sep 10, 2019 at 11:08 PM Tim Harris allidoiswin@users.sourceforge.net wrote:
Related
Support Requests: #354
Muchas gracias Robert, a mi me funciono muy bien tu solución.
Buena tarde!!!