Third-party team JARs broken with Java 9

Robocode is a programming tank game for Java

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#389 Third-party team JARs broken with Java 9

Milestone: 1.9.3.0

Status: closed

Owner: Flemming N. Larsen

Labels: None

Priority: 1

Updated: 2017-10-17

Created: 2017-10-03

Creator: MultiplyByZer0

Private: No

Loading teams from JAR files does not work on Java 9.

For example, if you try to run two ShadowTeams against each other, you will recieve this error message:

Got an error with abc.Shadow: java.lang.ClassNotFoundException: abc.Shadow
Got an error with abc.Shadow: java.lang.ClassNotFoundException: abc.Shadow
Got an error with abc.Shadow: java.lang.ClassNotFoundException: abc.Shadow
Got an error with abc.Shadow: java.lang.ClassNotFoundException: abc.Shadow
Got an error with abc.Shadow: java.lang.ClassNotFoundException: abc.Shadow
Got an error with abc.Shadow: java.lang.ClassNotFoundException: abc.Shadow
Got an error with abc.Shadow: java.lang.ClassNotFoundException: abc.Shadow
Got an error with abc.Shadow: java.lang.ClassNotFoundException: abc.Shadow
Got an error with abc.Shadow: java.lang.ClassNotFoundException: abc.Shadow
Got an error with abc.Shadow: java.lang.ClassNotFoundException: abc.Shadow

abc.ShadowTeam_3.83.jar is present in robots/, and it works when run under Java 8u144. This is with Robocode 1.9.2.6 on Windows 10.

Discussion

Flemming N. Larsen - 2017-10-12

summary: Third-party team JARs broken on Java 9 --> Third-party team JARs broken, e.g. abc.ShadowTeam_3.83.jar

Priority: 1 --> 3
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Flemming N. Larsen - 2017-10-12

The issue with abc.ShadowTeam_3.83.jar is not Java 9 related. It does not run under 1.9.2.6 with Java 8.

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MultiplyByZer0 - 2017-10-13

I can run ShadowTeam perfectly well on Java 8u144 (Windows 10, Robocode 1.9.3.0 git master).

More testing shows that not every third-party team is broken on Java 9. Teams that always work:

Polylunar 1.6

NightmareTeam 3.3

AlephTeam 0.34

LuminariousDuo 1.13

LunarTwins 1.4a

PhoenixTeam 0.905DC

HOFSwarm 1.1

MyFirstTeam

Teams that could not be loaded because of java.lang.ClassNotFoundException on Java 9, and worked on Java 8:

ShadowTeam 3.83

CombatTeam 3.25.0

GeminiTeam 2.1

Last edit: MultiplyByZer0 2017-10-13
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Flemming N. Larsen - 2017-10-13

summary: Third-party team JARs broken, e.g. abc.ShadowTeam_3.83.jar --> Third-party team JARs broken with Java 9

Priority: 3 --> 1
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Flemming N. Larsen - 2017-10-13

OK. I found out that my robot cache was not cleaned/removed correctly when switching betwen Java 8 and 9. You are right that the problem occurs with Java 9.

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MultiplyByZer0 - 2017-10-14

It seems that all of the affected teams are packaged with another JAR inside their JAR. E.g. abc.ShadowTeam_3.83.jar has abc.Shadow_3.83.jar inside of it.

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Flemming N. Larsen - 2017-10-16

status: open --> pending

assigned_to: Flemming N. Larsen

Group: Future Release --> 1.9.3.0
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Flemming N. Larsen - 2017-10-16

Finally, I got a fix for it. The URLClassLoader.findResource() method has changed in Java 9, which returns null for entries in JAR files inside JAR files (jarjar)

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MultiplyByZer0 - 2017-10-16

I can confirm this bug is fixed.

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Flemming N. Larsen - 2017-10-17

status: pending --> closed
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