Compilation Errors on Ubuntu 18.04

5 errors found:
File: /home/$USER/HelloWorld.java  [line: 1]
Error: The type java.lang.Object cannot be resolved. It is indirectly referenced from required .class files
File: /home/$USER/HelloWorld.java  [line: 1]
Error: The type java.lang.String cannot be resolved. It is indirectly referenced from required .class files
File: /home/$USER/HelloWorld.java  [line: 1]
Error: Implicit super constructor java.lang.Object() is undefined for default constructor. Must define an explicit constructor
File: /home/$USER/HelloWorld.java  [line: 2]
Error: String cannot be resolved to a type
File: /home/$USER/HelloWorld.java  [line: 3]
Error: System cannot be resolved

System Properties:
DrJava Version drjava-20120818-r5686
DrJava Build Time 20120818-0422

awt.toolkit = sun.awt.X11.XToolkit
java.specification.version = 11
sun.cpu.isalist = 
sun.jnu.encoding = UTF-8
java.class.path = drjava-stable-20120818-r5686.jar
sun.awt.enableExtraMouseButtons = true
java.vm.vendor = Ubuntu
sun.arch.data.model = 64
sun.font.fontmanager = sun.awt.X11FontManager
java.vendor.url = https://ubuntu.com/
user.timezone = Africa/Lusaka
os.name = Linux
java.vm.specification.version = 11
sun.java.launcher = SUN_STANDARD
user.country = ZM
sun.boot.library.path = /usr/lib/jvm/java-11-openjdk-amd64/lib
sun.java.command = drjava-stable-20120818-r5686.jar
drjava.debug.port = 41897
jdk.debug = release
sun.cpu.endian = little
user.home = <anonymized user.home>
user.language = en
java.specification.vendor = Oracle Corporation
java.version.date = 2019-07-16
java.home = /usr/lib/jvm/java-11-openjdk-amd64
file.separator = /
java.vm.compressedOopsMode = Zero based
line.separator = "\u000a"
java.specification.name = Java Platform API Specification
java.vm.specification.vendor = Oracle Corporation
java.awt.graphicsenv = sun.awt.X11GraphicsEnvironment
sun.management.compiler = HotSpot 64-Bit Tiered Compilers
java.runtime.version = 11.0.4+11-post-Ubuntu-1ubuntu218.04.3
user.name = <anonymized user.name>
path.separator = :
os.version = 4.15.0-70-generic
java.runtime.name = OpenJDK Runtime Environment
file.encoding = UTF-8
java.vm.name = OpenJDK 64-Bit Server VM
java.vendor.url.bug = https://bugs.launchpad.net/ubuntu/+source/openjdk-lts
java.io.tmpdir = /tmp
java.version = 11.0.4
user.dir = <anonymized user.home>/Downloads
os.arch = amd64
java.vm.specification.name = Java Virtual Machine Specification
java.awt.printerjob = sun.print.PSPrinterJob
sun.os.patch.level = unknown
java.library.path = /usr/java/packages/lib:/usr/lib/x86_64-linux-gnu/jni:/lib/x86_64-linux-gnu:/usr/lib/x86_64-linux-gnu:/usr/lib/jni:/lib:/usr/lib
java.vendor = Ubuntu
java.vm.info = mixed mode, sharing
java.vm.version = 11.0.4+11-post-Ubuntu-1ubuntu218.04.3
java.rmi.server.hostname = 127.0.0.1
sun.io.unicode.encoding = UnicodeLittle
java.class.version = 55.0

DrJava configuration file
In resource bundle edu.rice.cs.drjava.config.options:
    nothing

In shadowed configuration:
all.compiler.versions = true
key.delete.next = [shift DELETE]
key.delete.previous = [shift BACK_SPACE]
quit.prompt = false
show.finally.warnings = true
show.serial.warnings = true
show.fallthrough.warnings = true
show.path.warnings = true
recent.files = [<anonymized user.home>/HelloWorld.java,<anonymized user.home>/Hello.java]
window.height = 1000
window.width = 1920
window.x = 0
window.y = 0
window.state = 6
last.dir = <anonymized user.home>/HelloWorld.java
last.interactions.dir = <anonymized user.home>
tabbedpanes.state = 960 540 700 400
new.version.notification.last = 1575536057556


Used memory: about 69.53 megabytes
Free memory: about 156.47 megabytes
Total memory: about 226 megabytes
Total memory can expand to: about 2.88 gigabytes

Number of processors/cores: 8

Compiler Discovery Log: