我正在尝试将我的Java Web项目连接到Firebase，因此我将能够将我的数据存储在Firestore中。我正在使用Java Admin SDK，遵循官方指南：FirebaseAdminSDK。可悲的是，我在FirebaseAp初始化时遇到异常：
java.lang.NoSuchMethodError: com.google.common.base.Preconditions.checkState(ZLjava/lang/String;Ljava/lang/Object;)V
at com.google.firebase.FirebaseApp.checkNotDeleted(FirebaseApp.java:352)
at com.google.firebase.FirebaseApp.getOptions(FirebaseApp.java:267)
at com.google.firebase.FirebaseApp$TokenRefresher.<init>(FirebaseApp.java:434)
at com.google.firebase.FirebaseApp$TokenRefresher$Factory.create(FirebaseApp.java:535)
at com.google.firebase.FirebaseApp.<init>(FirebaseApp.java:113)
at com.google.firebase.FirebaseApp.initializeApp(FirebaseApp.java:201)
at com.google.firebase.FirebaseApp.initializeApp(FirebaseApp.java:188)
现在，我在这里和那里阅读，这是guava项目的问题，建议使用不同版本的番石榴库。我尝试了从18开始的所有版本。
然后，我读到它可能是由我的类路径中的不同库引用的多个番石榴库引起的，它们在不同的版本中互相争斗。所以，我检查了maven依赖树，看看是否有多个依赖guava。不。
然后，我解压缩.WAR文件以查看使用我的应用程序将精确的罐子部署到glassfish。那里只有一个番石榴罐（我的pom.xml文件指向的那个）。说实话，我的想法已经用完了。请帮忙。您可以在下面看到pom.xml和生成的maven依赖树。
pom.hml
<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
<modelVersion>4.0.0</modelVersion>
<groupId>com.greenstudio</groupId>
<artifactId>trekking-project</artifactId>
<version>1.0</version>
<packaging>war</packaging>
<name>trekking-project</name>
<properties>
<endorsed.dir>${project.build.directory}/endorsed</endorsed.dir>
<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
</properties>
<dependencies>
<dependency>
<groupId>com.google.firebase</groupId>
<artifactId>firebase-admin</artifactId>
<version>5.6.0</version>
<exclusions>
<exclusion>
<artifactId>guava</artifactId>
<groupId>com.google.guava</groupId>
</exclusion>
</exclusions>
</dependency>
<dependency>
<groupId>com.google.guava</groupId>
<artifactId>guava</artifactId>
<version>21.0</version>
</dependency>
<dependency>
<groupId>joda-time</groupId>
<artifactId>joda-time</artifactId>
<version>2.9.9</version>
</dependency>
<dependency>
<groupId>org.eclipse.persistence</groupId>
<artifactId>eclipselink</artifactId>
<version>2.5.2</version>
<scope>provided</scope>
</dependency>
<dependency>
<groupId>org.eclipse.persistence</groupId>
<artifactId>org.eclipse.persistence.jpa.modelgen.processor</artifactId>
<version>2.5.2</version>
<scope>provided</scope>
</dependency>
<dependency>
<groupId>org.apache.httpcomponents</groupId>
<artifactId>httpcore</artifactId>
<version>4.3.3</version>
<type>jar</type>
</dependency>
<dependency>
<groupId>org.apache.httpcomponents</groupId>
<artifactId>httpclient</artifactId>
<version>4.3.6</version>
<type>jar</type>
</dependency>
<dependency>
<groupId>primefaces</groupId>
<artifactId>primefaces</artifactId>
<version>5.3</version>
</dependency>
<dependency>
<groupId>primefaces.blacktie</groupId>
<artifactId>primefaces.blacktie</artifactId>
<version>1.0</version>
</dependency>
<dependency>
<groupId>bootstrap</groupId>
<artifactId>bootstrap</artifactId>
<version>1.0</version>
</dependency>
<dependency>
<groupId>org.apache.commons.validator.routines.EmailValidatororg.apache.commons.validator.routines.EmailValidator</groupId>
<artifactId>org.apache.commons.validator.routines.EmailValidator</artifactId>
<version>1.0</version>
<type>jar</type>
</dependency>
<dependency>
<groupId>javax</groupId>
<artifactId>javaee-web-api</artifactId>
<version>7.0</version>
<scope>provided</scope>
</dependency>
</dependencies>
<build>
<plugins>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-compiler-plugin</artifactId>
<version>3.1</version>
<configuration>
<source>1.7</source>
<target>1.7</target>
<compilerArguments>
<endorseddirs>${endorsed.dir}</endorseddirs>
</compilerArguments>
</configuration>
</plugin>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-war-plugin</artifactId>
<version>2.3</version>
<configuration>
<failOnMissingWebXml>false</failOnMissingWebXml>
</configuration>
</plugin>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-dependency-plugin</artifactId>
<version>2.8</version>
<executions>
<execution>
<phase>validate</phase>
<goals>
<goal>copy</goal>
</goals>
<configuration>
<outputDirectory>${endorsed.dir}</outputDirectory>
<silent>true</silent>
<artifactItems>
<artifactItem>
<groupId>javax</groupId>
<artifactId>javaee-endorsed-api</artifactId>
<version>7.0</version>
<type>jar</type>
</artifactItem>
</artifactItems>
</configuration>
</execution>
</executions>
</plugin>
</plugins>
</build>
</project>
依赖树
[INFO] Scanning for projects...
Downloading from central: https://repo.maven.apache.org/maven2/org/apache/maven/plugins/maven-dependency-plugin/2.8/maven-dependency-plugin-2.8.pom
Downloaded from central: https://repo.maven.apache.org/maven2/org/apache/maven/plugins/maven-dependency-plugin/2.8/maven-dependency-plugin-2.8.pom (11 kB at 18 kB/s)
Downloading from central: https://repo.maven.apache.org/maven2/org/apache/maven/plugins/maven-dependency-plugin/2.8/maven-dependency-plugin-2.8.jar
Downloaded from central: https://repo.maven.apache.org/maven2/org/apache/maven/plugins/maven-dependency-plugin/2.8/maven-dependency-plugin-2.8.jar (153 kB at 709 kB/s)
[INFO]
[INFO] ------------------------------------------------------------------------
[INFO] Building trekking-project 1.0
[INFO] ------------------------------------------------------------------------
[WARNING] The POM for primefaces:primefaces:jar:5.3 is missing, no dependency information available
[WARNING] The POM for primefaces.blacktie:primefaces.blacktie:jar:1.0 is missing, no dependency information available
[WARNING] The POM for bootstrap:bootstrap:jar:1.0 is missing, no dependency information available
[WARNING] The POM for org.apache.commons.validator.routines.EmailValidatororg.apache.commons.validator.routines.EmailValidator:org.apache.commons.validator.routines.EmailValidator:jar:1.0 is missing, no dependency information available
[INFO]
[INFO] --- maven-dependency-plugin:2.8:tree (default-cli) @ trekking-project ---
Downloading from central: https://repo.maven.apache.org/maven2/org/codehaus/plexus/plexus-archiver/2.3/plexus-archiver-2.3.pom
Downloaded from central: https://repo.maven.apache.org/maven2/org/codehaus/plexus/plexus-archiver/2.3/plexus-archiver-2.3.pom (3.4 kB at 38 kB/s)
Downloading from central: https://repo.maven.apache.org/maven2/org/apache/maven/shared/maven-dependency-analyzer/1.4/maven-dependency-analyzer-1.4.pom
Downloaded from central: https://repo.maven.apache.org/maven2/org/apache/maven/shared/maven-dependency-analyzer/1.4/maven-dependency-analyzer-1.4.pom (5.2 kB at 58 kB/s)
Downloading from central: https://repo.maven.apache.org/maven2/org/codehaus/plexus/plexus-archiver/2.3/plexus-archiver-2.3.jar
Downloading from central: https://repo.maven.apache.org/maven2/org/apache/maven/shared/maven-dependency-analyzer/1.4/maven-dependency-analyzer-1.4.jar
Downloaded from central: https://repo.maven.apache.org/maven2/org/apache/maven/shared/maven-dependency-analyzer/1.4/maven-dependency-analyzer-1.4.jar (27 kB at 105 kB/s)
Downloaded from central: https://repo.maven.apache.org/maven2/org/codehaus/plexus/plexus-archiver/2.3/plexus-archiver-2.3.jar (186 kB at 704 kB/s)
[INFO] com.greenstudio:trekking-project:war:1.0
[INFO] +- com.google.firebase:firebase-admin:jar:5.6.0:compile
[INFO] | +- com.google.api-client:google-api-client:jar:1.22.0:compile
[INFO] | | +- com.google.oauth-client:google-oauth-client:jar:1.22.0:compile
[INFO] | | \- com.google.http-client:google-http-client-jackson2:jar:1.22.0:compile
[INFO] | | \- com.fasterxml.jackson.core:jackson-core:jar:2.1.3:compile
[INFO] | +- com.google.api-client:google-api-client-gson:jar:1.22.0:compile
[INFO] | | \- com.google.http-client:google-http-client-gson:jar:1.22.0:compile
[INFO] | | \- com.google.code.gson:gson:jar:2.1:compile
[INFO] | +- com.google.http-client:google-http-client:jar:1.22.0:compile
[INFO] | | \- com.google.code.findbugs:jsr305:jar:1.3.9:compile
[INFO] | +- com.google.api:api-common:jar:1.2.0:compile
[INFO] | +- com.google.auth:google-auth-library-oauth2-http:jar:0.8.0:compile
[INFO] | | \- com.google.auth:google-auth-library-credentials:jar:0.8.0:compile
[INFO] | +- com.google.cloud:google-cloud-storage:jar:1.7.0:compile
[INFO] | | +- com.google.cloud:google-cloud-core:jar:1.7.0:compile
[INFO] | | | +- com.google.api:gax:jar:1.8.1:compile
[INFO] | | | +- com.google.protobuf:protobuf-java-util:jar:3.3.1:compile
[INFO] | | | +- com.google.api.grpc:proto-google-common-protos:jar:0.1.20:compile
[INFO] | | | \- com.google.api.grpc:proto-google-iam-v1:jar:0.1.20:compile
[INFO] | | +- com.google.cloud:google-cloud-core-http:jar:1.7.0:compile
[INFO] | | | +- com.google.http-client:google-http-client-appengine:jar:1.22.0:compile
[INFO] | | | \- com.google.http-client:google-http-client-jackson:jar:1.22.0:compile
[INFO] | | | \- org.codehaus.jackson:jackson-core-asl:jar:1.9.11:compile
[INFO] | | \- com.google.apis:google-api-services-storage:jar:v1-rev108-1.22.0:compile
[INFO] | +- com.google.cloud:google-cloud-firestore:jar:0.25.0-beta:compile
[INFO] | | +- io.netty:netty-tcnative-boringssl-static:jar:2.0.3.Final:compile
[INFO] | | +- com.google.cloud:google-cloud-core-grpc:jar:1.7.0:compile
[INFO] | | | +- com.google.protobuf:protobuf-java:jar:3.3.1:compile
[INFO] | | | +- io.grpc:grpc-protobuf:jar:1.6.1:compile
[INFO] | | | | \- io.grpc:grpc-protobuf-lite:jar:1.6.1:compile
[INFO] | | | \- io.grpc:grpc-context:jar:1.6.1:compile
[INFO] | | +- com.google.api:gax-grpc:jar:0.25.1:compile
[INFO] | | | +- com.google.auto.value:auto-value:jar:1.2:compile
[INFO] | | | \- org.threeten:threetenbp:jar:1.3.3:compile
[INFO] | | +- com.google.api.grpc:proto-google-cloud-firestore-v1beta1:jar:0.1.20:compile
[INFO] | | +- io.grpc:grpc-netty:jar:1.6.1:compile
[INFO] | | | +- io.grpc:grpc-core:jar:1.6.1:compile (version selected from constraint [1.6.1,1.6.1])
[INFO] | | | | +- com.google.errorprone:error_prone_annotations:jar:2.0.19:compile
[INFO] | | | | +- com.google.instrumentation:instrumentation-api:jar:0.4.3:compile
[INFO] | | | | \- io.opencensus:opencensus-api:jar:0.5.1:compile
[INFO] | | | +- io.netty:netty-codec-http2:jar:4.1.14.Final:compile (version selected from constraint [4.1.14.Final,4.1.14.Final])
[INFO] | | | \- io.netty:netty-handler-proxy:jar:4.1.14.Final:compile
[INFO] | | | \- io.netty:netty-codec-socks:jar:4.1.14.Final:compile
[INFO] | | +- io.grpc:grpc-stub:jar:1.6.1:compile
[INFO] | | \- io.grpc:grpc-auth:jar:1.6.1:compile
[INFO] | +- org.json:json:jar:20160810:compile
[INFO] | +- org.slf4j:slf4j-api:jar:1.7.25:compile
[INFO] | +- io.netty:netty-codec-http:jar:4.1.14.Final:compile
[INFO] | | \- io.netty:netty-codec:jar:4.1.14.Final:compile
[INFO] | +- io.netty:netty-handler:jar:4.1.14.Final:compile
[INFO] | | \- io.netty:netty-buffer:jar:4.1.14.Final:compile
[INFO] | | \- io.netty:netty-common:jar:4.1.14.Final:compile
[INFO] | \- io.netty:netty-transport:jar:4.1.14.Final:compile
[INFO] | \- io.netty:netty-resolver:jar:4.1.14.Final:compile
[INFO] +- com.google.guava:guava:jar:21.0:compile
[INFO] +- joda-time:joda-time:jar:2.9.9:compile
[INFO] +- org.eclipse.persistence:eclipselink:jar:2.5.2:provided
[INFO] | +- org.eclipse.persistence:javax.persistence:jar:2.1.0:provided
[INFO] | \- org.eclipse.persistence:commonj.sdo:jar:2.1.1:provided
[INFO] +- org.eclipse.persistence:org.eclipse.persistence.jpa.modelgen.processor:jar:2.5.2:provided
[INFO] | +- org.eclipse.persistence:org.eclipse.persistence.core:jar:2.5.2:provided
[INFO] | | \- org.eclipse.persistence:org.eclipse.persistence.asm:jar:2.5.2:provided
[INFO] | \- org.eclipse.persistence:org.eclipse.persistence.jpa:jar:2.5.2:provided
[INFO] | +- org.eclipse.persistence:org.eclipse.persistence.antlr:jar:2.5.2:provided
[INFO] | \- org.eclipse.persistence:org.eclipse.persistence.jpa.jpql:jar:2.5.2:provided
[INFO] +- org.apache.httpcomponents:httpcore:jar:4.3.3:compile
[INFO] +- org.apache.httpcomponents:httpclient:jar:4.3.6:compile
[INFO] | +- commons-logging:commons-logging:jar:1.1.3:compile
[INFO] | \- commons-codec:commons-codec:jar:1.6:compile
[INFO] +- primefaces:primefaces:jar:5.3:compile
[INFO] +- primefaces.blacktie:primefaces.blacktie:jar:1.0:compile
[INFO] +- bootstrap:bootstrap:jar:1.0:compile
[INFO] +- org.apache.commons.validator.routines.EmailValidatororg.apache.commons.validator.routines.EmailValidator:org.apache.commons.validator.routines.EmailValidator:jar:1.0:compile
[INFO] \- javax:javaee-web-api:jar:7.0:provided
[INFO] ------------------------------------------------------------------------
[INFO] BUILD SUCCESS
[INFO] ------------------------------------------------------------------------
[INFO] Total time: 4.897 s
[INFO] Finished at: 2018-01-12T10:16:59+01:00
[INFO] Final Memory: 15M/215M
[INFO] ------------------------------------------------------------------------
我甚至下载了google firebase sdk的github存储库，并删除了那里的所有guava代码引用，但是在尝试读/写Firestore时我遇到了类似的错误。似乎其他一些谷歌库依赖于那个蹩脚的小罐子。
我在不同的依赖项中遇到了与Guava版本相同的问题。
我在Gradle中解决了这个问题：
configurations.all {
resolutionStrategy {
force 'com.google.guava:guava:17.0'
}
}
应该有Maven方式，否则从所有依赖项中排除Guava并使用您的版本明确添加它。
它在全球范围内强制执行Guava版本。幸运的是，版本17与我的所有依赖项兼容。无论是16岁还是18岁......都是令人伤心的事情，这些都是使用番石榴。
希望它有所帮助，问候