我有一个使用嵌入式MongoDB的Spring Boot项目。除了对象跨会话的持久性之外，它还能工作，即如果我停止并启动服务器，那么DB是空的。是否存在我应该设置的Spring属性？从服务器启动：
2020-09-05 16:46:12.149 INFO 14155 --- [ restartedMain] .s.d.r.c.RepositoryConfigurationDelegate : Bootstrapping Spring Data MongoDB repositories in DEFAULT mode.
2020-09-05 16:46:12.152 INFO 14155 --- [ restartedMain] .s.d.r.c.RepositoryConfigurationDelegate : Finished Spring Data repository scanning in 3ms. Found 1 MongoDB repository interfaces.
2020-09-05 16:46:12.192 INFO 14155 --- [ restartedMain] o.s.b.w.embedded.tomcat.TomcatWebServer : Tomcat initialized with port(s): 8080 (http)
2020-09-05 16:46:12.192 INFO 14155 --- [ restartedMain] o.apache.catalina.core.StandardService : Starting service [Tomcat]
2020-09-05 16:46:12.192 INFO 14155 --- [ restartedMain] org.apache.catalina.core.StandardEngine : Starting Servlet engine: [Apache Tomcat/9.0.37]
2020-09-05 16:46:12.200 INFO 14155 --- [ restartedMain] o.a.c.c.C.[Tomcat].[localhost].[/] : Initializing Spring embedded WebApplicationContext
2020-09-05 16:46:12.201 INFO 14155 --- [ restartedMain] w.s.c.ServletWebServerApplicationContext : Root WebApplicationContext: initialization completed in 129 ms
2020-09-05 16:46:12.284 INFO 14155 --- [ Thread-41] o.s.b.a.mongo.embedded.EmbeddedMongo : note: noprealloc may hurt performance in many applications
2020-09-05 16:46:12.286 INFO 14155 --- [ Thread-41] o.s.b.a.mongo.embedded.EmbeddedMongo : 2020-09-05T16:46:12.286-0400 I CONTROL [initandlisten] MongoDB starting : pid=15816 port=27017 dbpath=/tmp/embedmongo-db-6da83f46-38a7-4749-8a83-16096d0b9055 64-bit host=notebook
2020-09-05 16:46:12.286 INFO 14155 --- [ Thread-41] o.s.b.a.mongo.embedded.EmbeddedMongo : 2020-09-05T16:46:12.286-0400 I CONTROL [initandlisten] db version v3.5.5
2020-09-05 16:46:12.286 INFO 14155 --- [ Thread-41] o.s.b.a.mongo.embedded.EmbeddedMongo : 2020-09-05T16:46:12.286-0400 I CONTROL [initandlisten] git version: 98515c812b6fa893613f063dae568ff8319cbfbd
2020-09-05 16:46:12.286 INFO 14155 --- [ Thread-41] o.s.b.a.mongo.embedded.EmbeddedMongo : 2020-09-05T16:46:12.286-0400 I CONTROL [initandlisten] allocator: tcmalloc
2020-09-05 16:46:12.286 INFO 14155 --- [ Thread-41] o.s.b.a.mongo.embedded.EmbeddedMongo : 2020-09-05T16:46:12.286-0400 I CONTROL [initandlisten] modules: none
2020-09-05 16:46:12.286 INFO 14155 --- [ Thread-41] o.s.b.a.mongo.embedded.EmbeddedMongo : 2020-09-05T16:46:12.286-0400 I CONTROL [initandlisten] build environment:
2020-09-05 16:46:12.286 INFO 14155 --- [ Thread-41] o.s.b.a.mongo.embedded.EmbeddedMongo : 2020-09-05T16:46:12.286-0400 I CONTROL [initandlisten] distarch: x86_64
2020-09-05 16:46:12.286 INFO 14155 --- [ Thread-41] o.s.b.a.mongo.embedded.EmbeddedMongo : 2020-09-05T16:46:12.286-0400 I CONTROL [initandlisten] target_arch: x86_64
2020-09-05 16:46:12.286 INFO 14155 --- [ Thread-41] o.s.b.a.mongo.embedded.EmbeddedMongo : 2020-09-05T16:46:12.286-0400 I CONTROL [initandlisten] options: { net: { bindIp: "127.0.0.1", http: { enabled: false }, port: 27017 }, security: { authorization: "disabled" }, storage: { dbPath: "/tmp/embedmongo-db-6da83f46-38a7-4749-8a83-16096d0b9055", journal: { enabled: false }, mmapv1: { preallocDataFiles: false, smallFiles: true }, syncPeriodSecs: 0.0 } }
2020-09-05 16:46:12.289 INFO 14155 --- [ Thread-41] o.s.b.a.mongo.embedded.EmbeddedMongo : 2020-09-05T16:46:12.289-0400 I STORAGE [initandlisten]
2020-09-05 16:46:12.289 INFO 14155 --- [ Thread-41] o.s.b.a.mongo.embedded.EmbeddedMongo : 2020-09-05T16:46:12.289-0400 I STORAGE [initandlisten] ** WARNING: Using the XFS filesystem is strongly recommended with the WiredTiger storage engine
2020-09-05 16:46:12.290 INFO 14155 --- [ Thread-41] o.s.b.a.mongo.embedded.EmbeddedMongo : 2020-09-05T16:46:12.289-0400 I STORAGE [initandlisten] ** See http://dochub.mongodb.org/core/prodnotes-filesystem
2020-09-05 16:46:12.290 INFO 14155 --- [ Thread-41] o.s.b.a.mongo.embedded.EmbeddedMongo : 2020-09-05T16:46:12.289-0400 I STORAGE [initandlisten] wiredtiger_open config: create,cache_size=7423M,session_max=20000,eviction=(threads_min=4,threads_max=4),config_base=false,statistics=(fast),log=(enabled=true,archive=true,path=journal,compressor=snappy),file_manager=(close_idle_time=100000),checkpoint=(wait=0,log_size=2GB),statistics_log=(wait=0),verbose=(recovery_progress),,log=(enabled=false),
2020-09-05 16:46:13.626 INFO 14155 --- [ Thread-41] o.s.b.a.mongo.embedded.EmbeddedMongo : 2020-09-05T16:46:13.626-0400 W STORAGE [initandlisten] Detected configuration for non-active storage engine mmapv1 when current storage engine is wiredTiger
2020-09-05 16:46:13.627 INFO 14155 --- [ Thread-41] o.s.b.a.mongo.embedded.EmbeddedMongo : 2020-09-05T16:46:13.626-0400 I CONTROL [initandlisten]
2020-09-05 16:46:13.627 INFO 14155 --- [ Thread-41] o.s.b.a.mongo.embedded.EmbeddedMongo : 2020-09-05T16:46:13.626-0400 I CONTROL [initandlisten] ** NOTE: This is a development version (3.5.5) of MongoDB.
2020-09-05 16:46:13.627 INFO 14155 --- [ Thread-41] o.s.b.a.mongo.embedded.EmbeddedMongo : 2020-09-05T16:46:13.626-0400 I CONTROL [initandlisten] ** Not recommended for production.
2020-09-05 16:46:13.627 INFO 14155 --- [ Thread-41] o.s.b.a.mongo.embedded.EmbeddedMongo : 2020-09-05T16:46:13.626-0400 I CONTROL [initandlisten]
2020-09-05 16:46:13.627 INFO 14155 --- [ Thread-41] o.s.b.a.mongo.embedded.EmbeddedMongo : 2020-09-05T16:46:13.626-0400 I CONTROL [initandlisten]
2020-09-05 16:46:13.627 INFO 14155 --- [ Thread-41] o.s.b.a.mongo.embedded.EmbeddedMongo : 2020-09-05T16:46:13.626-0400 I CONTROL [initandlisten] ** WARNING: soft rlimits too low. rlimits set to 63244 processes, 1048576 files. Number of processes should be at least 524288 : 0.5 times number of files.
2020-09-05 16:46:14.299 INFO 14155 --- [ Thread-41] o.s.b.a.mongo.embedded.EmbeddedMongo : 2020-09-05T16:46:14.299-0400 I FTDC [initandlisten] Initializing full-time diagnostic data capture with directory '/tmp/embedmongo-db-6da83f46-38a7-4749-8a83-16096d0b9055/diagnostic.data'
2020-09-05 16:46:14.688 INFO 14155 --- [ Thread-41] o.s.b.a.mongo.embedded.EmbeddedMongo : 2020-09-05T16:46:14.687-0400 I INDEX [initandlisten] build index on: admin.system.version properties: { v: 2, key: { version: 1 }, name: "incompatible_with_version_32", ns: "admin.system.version" }
2020-09-05 16:46:14.688 INFO 14155 --- [ Thread-41] o.s.b.a.mongo.embedded.EmbeddedMongo : 2020-09-05T16:46:14.688-0400 I INDEX [initandlisten] building index using bulk method; build may temporarily use up to 500 megabytes of RAM
2020-09-05 16:46:14.690 INFO 14155 --- [ Thread-41] o.s.b.a.mongo.embedded.EmbeddedMongo : 2020-09-05T16:46:14.689-0400 I INDEX [initandlisten] build index done. scanned 0 total records. 0 secs
2020-09-05 16:46:14.691 INFO 14155 --- [ Thread-41] o.s.b.a.mongo.embedded.EmbeddedMongo : 2020-09-05T16:46:14.690-0400 I COMMAND [initandlisten] setting featureCompatibilityVersion to 3.4
2020-09-05 16:46:14.691 INFO 14155 --- [ Thread-41] o.s.b.a.mongo.embedded.EmbeddedMongo : 2020-09-05T16:46:14.691-0400 I NETWORK [thread1] waiting for connections on port 27017
2020-09-05 16:46:14.691 INFO 14155 --- [ restartedMain] d.f.embed.mongo.MongodExecutable : start de.flapdoodle.embed.mongo.config.MongodConfigBuilder$ImmutableMongodConfig@5869c82a
2020-09-05 16:46:14.696 INFO 14155 --- [ restartedMain] org.mongodb.driver.cluster : Cluster created with settings {hosts=[localhost:27017], mode=SINGLE, requiredClusterType=UNKNOWN, serverSelectionTimeout='30000 ms'}
2020-09-05 16:46:14.699 INFO 14155 --- [ Thread-41] o.s.b.a.mongo.embedded.EmbeddedMongo : 2020-09-05T16:46:14.698-0400 I NETWORK [thread1] connection accepted from 127.0.0.1:41658 #1 (1 connection now open)
2020-09-05 16:46:14.700 INFO 14155 --- [ Thread-41] o.s.b.a.mongo.embedded.EmbeddedMongo : 2020-09-05T16:46:14.700-0400 I NETWORK [conn1] received client metadata from 127.0.0.1:41658 conn1: { driver: { name: "mongo-java-driver|sync|spring-boot", version: "4.0.5" }, os: { type: "Linux", name: "Linux", architecture: "amd64", version: "5.4.0-45-generic" }, platform: "Java/Private Build/14.0.1+7-Ubuntu-1ubuntu1" }
2020-09-05 16:46:14.702 INFO 14155 --- [localhost:27017] org.mongodb.driver.connection : Opened connection [connectionId{localValue:7, serverValue:1}] to localhost:27017
2020-09-05 16:46:14.703 INFO 14155 --- [localhost:27017] org.mongodb.driver.cluster : Monitor thread successfully connected to server with description ServerDescription{address=localhost:27017, type=STANDALONE, state=CONNECTED, ok=true, minWireVersion=0, maxWireVersion=5, maxDocumentSize=16777216, logicalSessionTimeoutMinutes=null, roundTripTimeNanos=809545}
2020-09-05 16:46:14.718 INFO 14155 --- [ restartedMain] o.s.b.d.a.OptionalLiveReloadServer : LiveReload server is running on port 35729
2020-09-05 16:46:14.749 INFO 14155 --- [ restartedMain] o.s.s.concurrent.ThreadPoolTaskExecutor : Initializing ExecutorService 'applicationTaskExecutor'
2020-09-05 16:46:14.756 INFO 14155 --- [ restartedMain] o.s.b.a.w.s.WelcomePageHandlerMapping : Adding welcome page template: index
2020-09-05 16:46:14.777 INFO 14155 --- [ restartedMain] o.s.b.w.embedded.tomcat.TomcatWebServer : Tomcat started on port(s): 8080 (http) with context path ''
感谢任何帮助，Craig
özkan pakdil给我指了指另一个帖子，里面有答案。默认的数据库位置是/tmp，它不会在那里持久存在。我在application.properties中添加了spring属性：CCD_ 1，并且它现在保持跨会话。工作完成了！