Spring Boot Firebase JsonWriter

Question

我有一个非常简单的 Spring Boot 应用程序，它具有以下依赖项。

compile(
    "org.springframework.boot:spring-boot-starter-actuator",
    "org.springframework.boot:spring-boot-starter-data-rest",
    "org.springframework.boot:spring-boot-configuration-processor",
    "org.jetbrains.kotlin:kotlin-stdlib-jre8:2.1.3",
    "org.jetbrains.kotlin:kotlin-reflect:2.1.3",
    "io.reactivex.rxjava2:rxjava:2.1.3",
    "com.google.firebase:firebase-admin:5.5.0"
)

我只是想将 POJO 放到我的实时 firebase 数据库中。

val db = FirebaseDatabase.getInstance()
db.reference.setValue(
    SomePojo().apply {
        name = ""
        someOtherProp = "Some other value"
    },
    { err, _ ->
        println("error=$err")
    })

但是在日志中我可以看到库内部出了点问题。

2017-11-17 15:18:08.376  INFO 1377 --- [           main] s.b.c.e.t.TomcatEmbeddedServletContainer : Tomcat started on port(s): 8080 (http)
2017-11-17 15:18:08.385  INFO 1377 --- [           main] be.topradio.metadata.AppKt               : Started AppKt in 19.051 seconds (JVM running for 19.615)
2017-11-17 15:18:08.908 ERROR 1377 --- [eDatabaseWorker] c.google.firebase.database.core.RunLoop  : Uncaught exception in Firebase Database runloop (5.5.0). Please report to firebase-database-client@google.com

java.lang.NoSuchMethodError: org.json.JSONStringer.object()Lorg/json/JSONWriter;
    at com.google.firebase.database.util.JsonMapper.serializeJsonValue(JsonMapper.java:72) ~[firebase-admin-5.5.0.jar:na]
    at com.google.firebase.database.util.JsonMapper.serializeJsonValue(JsonMapper.java:61) ~[firebase-admin-5.5.0.jar:na]
    at com.google.firebase.database.util.JsonMapper.serializeJson(JsonMapper.java:41) ~[firebase-admin-5.5.0.jar:na]
    at com.google.firebase.database.util.GAuthToken.serializeToString(GAuthToken.java:67) ~[firebase-admin-5.5.0.jar:na]
    at com.google.firebase.database.core.JvmAuthTokenProvider.wrapOAuthToken(JvmAuthTokenProvider.java:86) ~[firebase-admin-5.5.0.jar:na]
    at com.google.firebase.database.core.JvmAuthTokenProvider.getToken(JvmAuthTokenProvider.java:66) ~[firebase-admin-5.5.0.jar:na]
    at com.google.firebase.database.core.Context$1.getToken(Context.java:63) ~[firebase-admin-5.5.0.jar:na]
    at com.google.firebase.database.connection.PersistentConnectionImpl$1.run(PersistentConnectionImpl.java:481) ~[firebase-admin-5.5.0.jar:na]
    at com.google.firebase.database.connection.util.RetryHelper$1.run(RetryHelper.java:93) ~[firebase-admin-5.5.0.jar:na]
    at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511) ~[na:1.8.0_60]
    at java.util.concurrent.FutureTask.run(FutureTask.java:266) ~[na:1.8.0_60]
    at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180) ~[na:1.8.0_60]
    at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293) ~[na:1.8.0_60]
    at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142) ~[na:1.8.0_60]
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617) [na:1.8.0_60]
    at java.lang.Thread.run(Thread.java:745) [na:1.8.0_60]

有什么想法吗？

Answer 1

tl;博士

我正准备通过排除 Spring Boot 的配置处理器引入的依赖项来消除此错误：

compile('org.springframework.boot:spring-boot-configuration-processor') {
       exclude group: 'com.vaadin.external.google'
}

另外（虽然我没有再看到这个错误），我相信它也应该被排除在 Spring Boot 的启动器测试依赖项中。

testCompile('org.springframework.boot:spring-boot-starter-test') {
       exclude group: 'com.vaadin.external.google'
}

我是如何找到这个的

从StackOverflow question you visited 开始，我开始研究包“org.json”中的 JSONStringer 类的潜在问题。所以我在想依赖于'org.json'的依赖的版本冲突

运行./gradlew dependencyInsight --dependency org.json，我收到了：

org.json:json:20160810 -> 20140107
+--- com.google.cloud:google-cloud-core:1.7.0
|    +--- com.google.cloud:google-cloud-storage:1.7.0
|    |    \--- com.google.firebase:firebase-admin:5.5.0
|    |         \--- compile
|    +--- com.google.cloud:google-cloud-firestore:0.25.0-beta
|    |    \--- com.google.firebase:firebase-admin:5.5.0 (*)
|    +--- com.google.cloud:google-cloud-core-http:1.7.0
|    |    +--- com.google.cloud:google-cloud-storage:1.7.0 (*)
|    |    \--- com.google.cloud:google-cloud-firestore:0.25.0-beta (*)
|    \--- com.google.cloud:google-cloud-core-grpc:1.7.0
|         \--- com.google.cloud:google-cloud-firestore:0.25.0-beta (*)
\--- com.google.firebase:firebase-admin:5.5.0 (*)

(*) - dependencies omitted (listed previously)

所以只有 google 依赖项在使用这个包。我怀疑这个问题不是谷歌依赖中的版本冲突，所以我查找了 Spring 可能与 org.json 包存在的冲突。

Google 搜索“Spring boot org.json”将我带到Github issue，关于与 json 库的冲突。该问题提到对于spring-boot-starter-test，因为“需要org.skyscreamer:jsonassert:1.4.0，排除com.vaadin.external.google:android-json:0.0.20131108.vaadin1。”

从此，我运行：`./gradlew dependencyInsight --dependency 'com.vaadin.external.google' 引用了'spring-boot-configuration-processor'。