gradlew собрать сбой на Travis-CI

Я пытаюсь получить частную сборку, чтобы вести себя на Travis-CI Pro, но он продолжает жаловаться, потому что ./gradlew assemble не в состоянии. Вот полный лог:

Using worker: worker-linux-docker-4002cef1.prod.travis-ci.com:travis-linux-15

travis_fold:start:system_info
[0K[33;1mBuild system information[0m
Build language: java
Build group: stable
Build dist: precise
[34m[1mBuild image provisioning date and time[0m
Thu Feb  5 15:09:33 UTC 2015
[34m[1mOperating System Details[0m
Distributor ID: Ubuntu
Description:    Ubuntu 12.04.5 LTS
Release:    12.04
Codename:   precise
[34m[1mLinux Version[0m
3.13.0-29-generic
[34m[1mCookbooks Version[0m
a68419e https://github.com/travis-ci/travis-cookbooks/tree/a68419e
[34m[1mGCC version[0m
gcc (Ubuntu/Linaro 4.6.3-1ubuntu5) 4.6.3
Copyright (C) 2011 Free Software Foundation, Inc.
This is free software; see the source for copying conditions.  There is NO
warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.

[34m[1mLLVM version[0m
clang version 3.4 (tags/RELEASE_34/final)
Target: x86_64-unknown-linux-gnu
Thread model: posix
[34m[1mPre-installed Ruby versions[0m
ruby-1.9.3-p551
[34m[1mPre-installed Node.js versions[0m
v0.10.36
[34m[1mPre-installed Go versions[0m
1.4.1
[34m[1mRedis version[0m
redis-server 2.8.19
[34m[1mriak version[0m
2.0.2
[34m[1mMongoDB version[0m
MongoDB 2.4.12
[34m[1mCouchDB version[0m
couchdb 1.6.1
[34m[1mNeo4j version[0m
1.9.4
[34m[1mRabbitMQ Version[0m
3.4.3
[34m[1mElasticSearch version[0m
1.4.0
[34m[1mInstalled Sphinx versions[0m
2.0.10
2.1.9
2.2.6
[34m[1mDefault Sphinx version[0m
2.2.6
[34m[1mInstalled Firefox version[0m
firefox 31.0esr
[34m[1mPhantomJS version[0m
1.9.8
[34m[1mant -version[0m
Apache Ant(TM) version 1.8.2 compiled on December 3 2011
[34m[1mmvn -version[0m
Apache Maven 3.2.5 (12a6b3acb947671f09b81f49094c53f426d8cea1; 2014-12-14T17:29:23+00:00)
Maven home: /usr/local/maven
Java version: 1.7.0_76, vendor: Oracle Corporation
Java home: /usr/lib/jvm/java-7-oracle/jre
Default locale: en_US, platform encoding: ANSI_X3.4-1968
OS name: "linux", version: "3.13.0-29-generic", arch: "amd64", family: "unix"
travis_fold:end:system_info
[0K

Installing an SSH key from: default repository key
Key fingerprint: 23:d9:a6:24:7b:c4:67:d8:c6:45:13:5c:0f:56:04:92

travis_fold:start:git.checkout
[0Ktravis_time:start:06c3823f
[0K$ git clone --depth=50 --branch=cli-interface git@github.com:atomicpages/java-grader.git atomicpages/java-grader
Cloning into 'atomicpages/java-grader'...
remote: Counting objects: 62, done.[K
remote: Compressing objects:   2% (1/45)   [K
remote: Compressing objects:   4% (2/45)   [K
remote: Compressing objects:   6% (3/45)   [K
remote: Compressing objects:   8% (4/45)   [K
remote: Compressing objects:  11% (5/45)   [K
remote: Compressing objects:  13% (6/45)   [K
remote: Compressing objects:  15% (7/45)   [K
remote: Compressing objects:  17% (8/45)   [K
remote: Compressing objects:  20% (9/45)   [K
remote: Compressing objects:  22% (10/45)   [K
remote: Compressing objects:  24% (11/45)   [K
remote: Compressing objects:  26% (12/45)   [K
remote: Compressing objects:  28% (13/45)   [K
remote: Compressing objects:  31% (14/45)   [K
remote: Compressing objects:  33% (15/45)   [K
remote: Compressing objects:  35% (16/45)   [K
remote: Compressing objects:  37% (17/45)   [K
remote: Compressing objects:  40% (18/45)   [K
remote: Compressing objects:  42% (19/45)   [K
remote: Compressing objects:  44% (20/45)   [K
remote: Compressing objects:  46% (21/45)   [K
remote: Compressing objects:  48% (22/45)   [K
remote: Compressing objects:  51% (23/45)   [K
remote: Compressing objects:  53% (24/45)   [K
remote: Compressing objects:  55% (25/45)   [K
remote: Compressing objects:  57% (26/45)   [K
remote: Compressing objects:  60% (27/45)   [K
remote: Compressing objects:  62% (28/45)   [K
remote: Compressing objects:  64% (29/45)   [K
remote: Compressing objects:  66% (30/45)   [K
remote: Compressing objects:  68% (31/45)   [K
remote: Compressing objects:  71% (32/45)   [K
remote: Compressing objects:  73% (33/45)   [K
remote: Compressing objects:  75% (34/45)   [K
remote: Compressing objects:  77% (35/45)   [K
remote: Compressing objects:  80% (36/45)   [K
remote: Compressing objects:  82% (37/45)   [K
remote: Compressing objects:  84% (38/45)   [K
remote: Compressing objects:  86% (39/45)   [K
remote: Compressing objects:  88% (40/45)   [K
remote: Compressing objects:  91% (41/45)   [K
remote: Compressing objects:  93% (42/45)   [K
remote: Compressing objects:  95% (43/45)   [K
remote: Compressing objects:  97% (44/45)   [K
remote: Compressing objects: 100% (45/45)   [K
remote: Compressing objects: 100% (45/45), done.[K
Receiving objects:   1% (1/62)   
Receiving objects:   3% (2/62)   
Receiving objects:   4% (3/62)   
Receiving objects:   6% (4/62)   
Receiving objects:   8% (5/62)   
Receiving objects:   9% (6/62)   
Receiving objects:  11% (7/62)   
Receiving objects:  12% (8/62)   
Receiving objects:  14% (9/62)   
Receiving objects:  16% (10/62)   
Receiving objects:  17% (11/62)   
Receiving objects:  19% (12/62)   
Receiving objects:  20% (13/62)   
Receiving objects:  22% (14/62)   
Receiving objects:  24% (15/62)   
remote: Total 62 (delta 13), reused 54 (delta 5), pack-reused 0[K
Receiving objects:  25% (16/62)   
Receiving objects:  27% (17/62)   
Receiving objects:  29% (18/62)   
Receiving objects:  30% (19/62)   
Receiving objects:  32% (20/62)   
Receiving objects:  33% (21/62)   
Receiving objects:  35% (22/62)   
Receiving objects:  37% (23/62)   
Receiving objects:  38% (24/62)   
Receiving objects:  40% (25/62)   
Receiving objects:  41% (26/62)   
Receiving objects:  43% (27/62)   
Receiving objects:  45% (28/62)   
Receiving objects:  46% (29/62)   
Receiving objects:  48% (30/62)   
Receiving objects:  50% (31/62)   
Receiving objects:  51% (32/62)   
Receiving objects:  53% (33/62)   
Receiving objects:  54% (34/62)   
Receiving objects:  56% (35/62)   
Receiving objects:  58% (36/62)   
Receiving objects:  59% (37/62)   
Receiving objects:  61% (38/62)   
Receiving objects:  62% (39/62)   
Receiving objects:  64% (40/62)   
Receiving objects:  66% (41/62)   
Receiving objects:  67% (42/62)   
Receiving objects:  69% (43/62)   
Receiving objects:  70% (44/62)   
Receiving objects:  72% (45/62)   
Receiving objects:  74% (46/62)   
Receiving objects:  75% (47/62)   
Receiving objects:  77% (48/62)   
Receiving objects:  79% (49/62)   
Receiving objects:  80% (50/62)   
Receiving objects:  82% (51/62)   
Receiving objects:  83% (52/62)   
Receiving objects:  85% (53/62)   
Receiving objects:  87% (54/62)   
Receiving objects:  88% (55/62)   
Receiving objects:  90% (56/62)   
Receiving objects:  91% (57/62)   
Receiving objects:  93% (58/62)   
Receiving objects:  95% (59/62)   
Receiving objects:  96% (60/62)   
Receiving objects:  98% (61/62)   
Receiving objects: 100% (62/62)   
Receiving objects: 100% (62/62), 13.52 KiB | 0 bytes/s, done.
Resolving deltas:   0% (0/13)   
Resolving deltas:  38% (5/13)   
Resolving deltas:  46% (6/13)   
Resolving deltas:  53% (7/13)   
Resolving deltas:  69% (9/13)   
Resolving deltas:  76% (10/13)   
Resolving deltas:  84% (11/13)   
Resolving deltas:  92% (12/13)   
Resolving deltas: 100% (13/13)   
Resolving deltas: 100% (13/13), done.
Checking connectivity... done.
travis_time:end:06c3823f:start=1450114509982135009,finish=1450114510406203180,duration=424068171
[0K$ cd atomicpages/java-grader
$ git checkout -qf d3c067dead18a524bf85efb7eb90cad63d47368c
travis_fold:end:git.checkout
[0K
[33;1mThis job is running on container-based infrastructure, which does not allow use of 'sudo', setuid and setguid executables.[0m
[33;1mIf you require sudo, add 'sudo: required' to your .travis.yml[0m
[33;1mSee http://docs.travis-ci.com/user/workers/container-based-infrastructure/ for details.[0m
$ jdk_switcher use oraclejdk8
Switching to Oracle JDK8 (java-8-oracle), JAVA_HOME will be set to /usr/lib/jvm/java-8-oracle
$ export TERM=dumb
$ java -Xmx32m -version
java version "1.8.0_31"
Java(TM) SE Runtime Environment (build 1.8.0_31-b13)
Java HotSpot(TM) 64-Bit Server VM (build 25.31-b07, mixed mode)
$ javac -J-Xmx32m -version
javac 1.8.0_31
travis_fold:start:install
[0Ktravis_time:start:16e15912
[0K$ ./gradlew assemble
Error: Could not find or load main class org.gradle.wrapper.GradleWrapperMain

[31;1mThe command "eval ./gradlew assemble" failed. Retrying, 2 of 3.[0m

Error: Could not find or load main class org.gradle.wrapper.GradleWrapperMain

[31;1mThe command "eval ./gradlew assemble" failed. Retrying, 3 of 3.[0m

Error: Could not find or load main class org.gradle.wrapper.GradleWrapperMain

[31;1mThe command "eval ./gradlew assemble" failed 3 times.[0m

travis_time:end:16e15912:start=1450114512754418536,finish=1450114515995381755,duration=3240963219
[0K
[31;1mThe command "./gradlew assemble" failed and exited with 1 during .[0m

Your build has been stopped.

Я не совсем уверен, что делать. Я следил за настройкой gradle для проекта в документации Travis, и он должен работать нормально... Вот мой конфигурационный файл travis

language: java
jdk:
  - oraclejdk8
  - oraclejdk7
  - openjdk7

before_script:
- chmod a+x gradlew

sccript: ./gradlew build

если я строю локально через IntelliJ IDEA или следующий:

• gradle build
• chmod a+x gradlew && ./gradlew build

Она работает безупречно. Есть намеки?