[Javassist] Fix project directory and maven build script (#9037)

The default source and test source directory for maven project are
src/main/java and src/test/java respectively. The author of Javassist
does specify a non-traditional location for the source and test source
and manually set it in the pom.xml. Although it does not affect the
normal project build, it does affect jacoco coverage report generator to
extract the source code of the project because Jacoco will not read the
pom.xml settings and only scan the default source and test source
directory for source code file. To remedy, this fix aim to do some
folder movement to move the source and test source back to the default
directory while pointing the pom.xml settings to the default directory.
These changes allow the project compile and execute as normal and also
allow jacoco correctly retrieve the source code for coverage report
generation.

This fix is necessary for fuzz-introspector coverage report to show the
code coverage down to the source code line.

Signed-off-by: Arthur Chan <arthur.chan@adalogics.com>

Signed-off-by: Arthur Chan <arthur.chan@adalogics.com>

projects/javassist/Dockerfile

@@ -26,4 +26,5 @@ RUN git clone --depth 1 https://github.com/jboss-javassist/javassist.git
 
 COPY build.sh $SRC/
 COPY ClassFuzzer.java $SRC/
+COPY pom.xml.diff $SRC/javassist
 WORKDIR $SRC/javassist

projects/javassist/build.sh

@@ -15,6 +15,13 @@
 #
 ################################################################################
 
+git apply pom.xml.diff
+mv ./src/main ./src/java
+mkdir ./src/main
+mv ./src/java ./src/main/java
+mv ./src/test ./src/java
+mkdir ./src/test
+mv ./src/java ./src/test/java
 
 MAVEN_ARGS="-Djavac.src.version=15 -Djavac.target.version=15 -DskipTests"
 $MVN package org.apache.maven.plugins:maven-shade-plugin:3.2.4:shade $MAVEN_ARGS

projects/javassist/pom.xml.diff

@@ -0,0 +1,15 @@
+diff --git a/pom.xml b/pom.xml
+index a604e16..52c8a7b 100644
+--- a/pom.xml
++++ b/pom.xml
+@@ -138,8 +138,8 @@
+     </snapshotRepository>
+   </distributionManagement>
+   <build>
+-    <sourceDirectory>src/main/</sourceDirectory>
+-    <testSourceDirectory>src/test/</testSourceDirectory>
++    <sourceDirectory>src/main/java/</sourceDirectory>
++    <testSourceDirectory>src/test/java/</testSourceDirectory>
+     <testResources>
+       <testResource>
+         <directory>src/test/resources</directory>