Test stuck with Springboot 4

[GLTron3000]

My team migrated a project from Spring Boot 3 to Spring Boot 4, going from version 2.6.0 to 2.7.1.

Previously working integration test now hang indefinitely, throw no warnings (and seems to run out of memory at some point ?).

I am sorry if it isn't a issue with the zonky itself, but we cant seems to find the problem and ran out of ideas :(

The test class

@SpringBootTest(classes = MageBackendApplication.class, webEnvironment = SpringBootTest.WebEnvironment.RANDOM_PORT)
@AutoConfigureEmbeddedDatabase(
        provider = AutoConfigureEmbeddedDatabase.DatabaseProvider.EMBEDDED,
        type =  AutoConfigureEmbeddedDatabase.DatabaseType.POSTGRES,
        refresh = AutoConfigureEmbeddedDatabase.RefreshMode.BEFORE_CLASS)
@ActiveProfiles({"test", "jpa-postgres", "liquibase", "swagger", "forgerock-indus"})
@AutoConfigureMockMvc
class IntegrationDemoTest {

    @Autowired
    private MockMvc mockMvc;

    @SneakyThrows
    @Test
    void testYourAPI() {
        mockMvc.perform(MockMvcRequestBuilders.get("/api/v1/demo"))
                .andExpect(status().isOk())
                .andExpect(jsonPath("$.content", hasSize(20)))
                .andExpect(jsonPath("$.content[0].id", equalTo(1)))
                .andExpect(jsonPath("$.content[0].name", equalTo("Pen")))
                .andExpect(jsonPath(
                        "$.content[0].description", equalTo("A writing instrument used to apply ink to a surface.")))
                .andExpect(jsonPath("$.content[1].id", equalTo(2)))
                .andExpect(jsonPath("$.content[1].name", equalTo("Notebook")))
                .andExpect(jsonPath(
                        "$.content[1].description",
                        equalTo("A bound collection of pages used for writing notes or keeping records.")))
                .andReturn();
    }
}

The output

:: Spring Boot ::                (v4.0.0)

2026-01-26T12:04:29.832+01:00  INFO 52026 --- [           main] c.m.m.c.s.a.WebSecurityConfigurationTest : Starting WebSecurityConfigurationTest using Java 25.0.1 with PID 52026 ()
2026-01-26T12:04:29.841+01:00  INFO 52026 --- [           main] c.m.m.c.s.a.WebSecurityConfigurationTest : The following 4 profiles are active: "test", "jpa-postgres", "liquibase","swagger"
2026-01-26T12:04:34.557+01:00  INFO 52026 --- [           main] .s.d.r.c.RepositoryConfigurationDelegate : Bootstrapping Spring Data JPA repositories in DEFAULT mode.
2026-01-26T12:04:34.763+01:00  INFO 52026 --- [           main] .s.d.r.c.RepositoryConfigurationDelegate : Finished Spring Data repository scanning in 168 ms. Found 1 JPA repository interface.
2026-01-26T12:04:35.714+01:00  INFO 52026 --- [           main] EmbeddedDatabaseContextCustomizerFactory : Replacing 'dataSource' DataSource bean with embedded version
2026-01-26T12:04:36.352+01:00  WARN 52026 --- [           main] trationDelegate$BeanPostProcessorChecker : Bean 'io.zonky.test.db.config.EmbeddedDatabaseAutoConfiguration' of type [io.zonky.test.db.config.EmbeddedDatabaseAutoConfiguration$$SpringCGLIB$$0] is not eligible for getting processed by all BeanPostProcessors (for example: not eligible for auto-proxying). The currently created BeanPostProcessor [liquibaseDatabaseExtension] is declared through a non-static factory method on that class; consider declaring it as static instead.
2026-01-26T12:04:37.458+01:00  INFO 52026 --- [           main] o.s.boot.tomcat.TomcatWebServer          : Tomcat initialized with port 0 (http)
2026-01-26T12:04:37.532+01:00  INFO 52026 --- [           main] o.apache.catalina.core.StandardService   : Starting service [Tomcat]
2026-01-26T12:04:37.535+01:00  INFO 52026 --- [           main] o.apache.catalina.core.StandardEngine    : Starting Servlet engine: [Apache Tomcat/11.0.14]
2026-01-26T12:04:37.763+01:00  INFO 52026 --- [           main] b.w.c.s.WebApplicationContextInitializer : Root WebApplicationContext: initialization completed in 7721 ms
WARNING: A terminally deprecated method in sun.misc.Unsafe has been called
WARNING: sun.misc.Unsafe::objectFieldOffset has been called by io.zonky.test.db.shaded.com.google.common.util.concurrent.AbstractFuture$UnsafeAtomicHelper (file:.m2/repository/io/zonky/test/embedded-database-spring-test/2.7.1/embedded-database-spring-test-2.7.1.jar)
WARNING: Please consider reporting this to the maintainers of class io.zonky.test.db.shaded.com.google.common.util.concurrent.AbstractFuture$UnsafeAtomicHelper
WARNING: sun.misc.Unsafe::objectFieldOffset will be removed in a future release
2026-01-26T12:04:38.745+01:00  INFO 52026 --- [  prefetching-1] i.z.t.d.p.embedded.EmbeddedPostgres      : Detected a Linux x86_64 system
2026-01-26T12:04:38.857+01:00  INFO 52026 --- [  prefetching-1] .z.t.d.p.e.DefaultPostgresBinaryResolver : Detected distribution: 'Ubuntu'
2026-01-26T12:04:38.864+01:00  INFO 52026 --- [  prefetching-1] .z.t.d.p.e.DefaultPostgresBinaryResolver : System specific postgres binaries found: 'postgres-linux-x86_64.txz'
2026-01-26T12:04:39.104+01:00  INFO 52026 --- [  prefetching-1] i.z.t.d.p.embedded.EmbeddedPostgres      : Postgres binaries at /tmp/embedded-pg/PG-16e48326a2cbaa18f1179ea1efa0ffd0
2026-01-26T12:04:39.167+01:00  INFO 52026 --- [itdb:pid(52098)] i.z.t.d.p.embedded.EmbeddedPostgres      : The files belonging to this database system will be owned by user "thomas".
2026-01-26T12:04:39.174+01:00  INFO 52026 --- [itdb:pid(52098)] i.z.t.d.p.embedded.EmbeddedPostgres      : This user must also own the server process.
2026-01-26T12:04:39.175+01:00  INFO 52026 --- [itdb:pid(52098)] i.z.t.d.p.embedded.EmbeddedPostgres      :
2026-01-26T12:04:39.175+01:00  INFO 52026 --- [itdb:pid(52098)] i.z.t.d.p.embedded.EmbeddedPostgres      : The database cluster will be initialized with locale "en_US.UTF-8".
2026-01-26T12:04:39.183+01:00  INFO 52026 --- [itdb:pid(52098)] i.z.t.d.p.embedded.EmbeddedPostgres      : The default text search configuration will be set to "english".
2026-01-26T12:04:39.183+01:00  INFO 52026 --- [itdb:pid(52098)] i.z.t.d.p.embedded.EmbeddedPostgres      :
2026-01-26T12:04:39.183+01:00  INFO 52026 --- [itdb:pid(52098)] i.z.t.d.p.embedded.EmbeddedPostgres      : Data page checksums are disabled.
2026-01-26T12:04:39.183+01:00  INFO 52026 --- [itdb:pid(52098)] i.z.t.d.p.embedded.EmbeddedPostgres      :
2026-01-26T12:04:39.183+01:00  INFO 52026 --- [itdb:pid(52098)] i.z.t.d.p.embedded.EmbeddedPostgres      : fixing permissions on existing directory /tmp/epg608847135664728551 ... ok
2026-01-26T12:04:39.183+01:00  INFO 52026 --- [itdb:pid(52098)] i.z.t.d.p.embedded.EmbeddedPostgres      : creating subdirectories ... ok
2026-01-26T12:04:39.183+01:00  INFO 52026 --- [itdb:pid(52098)] i.z.t.d.p.embedded.EmbeddedPostgres      : selecting dynamic shared memory implementation ... posix
2026-01-26T12:04:39.202+01:00  INFO 52026 --- [itdb:pid(52098)] i.z.t.d.p.embedded.EmbeddedPostgres      : selecting default max_connections ... 100
2026-01-26T12:04:39.250+01:00  INFO 52026 --- [itdb:pid(52098)] i.z.t.d.p.embedded.EmbeddedPostgres      : selecting default shared_buffers ... 128MB
2026-01-26T12:04:39.265+01:00  INFO 52026 --- [itdb:pid(52098)] i.z.t.d.p.embedded.EmbeddedPostgres      : selecting default time zone ... Europe/Paris
2026-01-26T12:04:39.274+01:00  INFO 52026 --- [itdb:pid(52098)] i.z.t.d.p.embedded.EmbeddedPostgres      : creating configuration files ... ok
2026-01-26T12:04:39.494+01:00  INFO 52026 --- [itdb:pid(52098)] i.z.t.d.p.embedded.EmbeddedPostgres      : running bootstrap script ... ok
2026-01-26T12:04:40.638+01:00  INFO 52026 --- [itdb:pid(52098)] i.z.t.d.p.embedded.EmbeddedPostgres      : performing post-bootstrap initialization ... ok
2026-01-26T12:04:41.222+01:00  INFO 52026 --- [itdb:pid(52098)] i.z.t.d.p.embedded.EmbeddedPostgres      : syncing data to disk ... ok
2026-01-26T12:04:41.222+01:00  INFO 52026 --- [itdb:pid(52098)] i.z.t.d.p.embedded.EmbeddedPostgres      :
2026-01-26T12:04:41.222+01:00  INFO 52026 --- [itdb:pid(52098)] i.z.t.d.p.embedded.EmbeddedPostgres      : Success. You can now start the database server using:
2026-01-26T12:04:41.226+01:00  INFO 52026 --- [itdb:pid(52098)] i.z.t.d.p.embedded.EmbeddedPostgres      :
2026-01-26T12:04:41.226+01:00  INFO 52026 --- [itdb:pid(52098)] i.z.t.d.p.embedded.EmbeddedPostgres      :     /tmp/embedded-pg/PG-16e48326a2cbaa18f1179ea1efa0ffd0/bin/pg_ctl -D /tmp/epg608847135664728551 -l logfile start
2026-01-26T12:04:41.226+01:00  INFO 52026 --- [itdb:pid(52098)] i.z.t.d.p.embedded.EmbeddedPostgres      :
2026-01-26T12:04:41.223+01:00  INFO 52026 --- [  prefetching-1] i.z.t.d.p.embedded.EmbeddedPostgres      : 903f4030-6031-4877-8ec2-0aa04bdb0528 initdb completed in 00:00:02.114
2026-01-26T12:04:41.249+01:00  INFO 52026 --- [  prefetching-1] i.z.t.d.p.embedded.EmbeddedPostgres      : 903f4030-6031-4877-8ec2-0aa04bdb0528 postmaster started as Process[pid=52112, exitValue="not exited"] on port 46185.  Waiting up to PT20S for server startup to finish.
2026-01-26T12:04:41.284+01:00  INFO 52026 --- [gres:pid(52112)] i.z.t.d.p.embedded.EmbeddedPostgres      : waiting for server to start....2026-01-26 12:04:41.284 CET [52116] LOG:  starting PostgreSQL 14.20 on x86_64-pc-linux-gnu, compiled by gcc (Ubuntu 7.5.0-3ubuntu1~18.04) 7.5.0, 64-bit
2026-01-26T12:04:41.289+01:00  INFO 52026 --- [gres:pid(52112)] i.z.t.d.p.embedded.EmbeddedPostgres      : 2026-01-26 12:04:41.289 CET [52116] LOG:  listening on IPv4 address "127.0.0.1", port 46185
2026-01-26T12:04:41.299+01:00  INFO 52026 --- [gres:pid(52112)] i.z.t.d.p.embedded.EmbeddedPostgres      : 2026-01-26 12:04:41.299 CET [52116] LOG:  listening on Unix socket "/tmp/.s.PGSQL.46185"
2026-01-26T12:04:41.325+01:00  INFO 52026 --- [gres:pid(52112)] i.z.t.d.p.embedded.EmbeddedPostgres      : 2026-01-26 12:04:41.323 CET [52117] LOG:  database system was shut down at 2026-01-26 12:04:40 CET
2026-01-26T12:04:41.335+01:00  INFO 52026 --- [gres:pid(52112)] i.z.t.d.p.embedded.EmbeddedPostgres      : 2026-01-26 12:04:41.329 CET [52116] LOG:  database system is ready to accept connections
2026-01-26T12:04:41.363+01:00  INFO 52026 --- [gres:pid(52112)] i.z.t.d.p.embedded.EmbeddedPostgres      :  done
2026-01-26T12:04:41.363+01:00  INFO 52026 --- [gres:pid(52112)] i.z.t.d.p.embedded.EmbeddedPostgres      : server started
2026-01-26T12:04:41.649+01:00  INFO 52026 --- [  prefetching-1] i.z.t.d.p.embedded.EmbeddedPostgres      : 903f4030-6031-4877-8ec2-0aa04bdb0528 postmaster startup finished in 00:00:00.409

[robinmarechal]

I'm facing some issues as well while upgrading to Spring Boot 4 and found a hack to get it working.
Maybe it will help you, until we get a real fix.

First of all make sure you have the right versions of liquibase in your dependencies, if you declared them yourself in your pom.xml / gradle.properties.
Spring Boot 4 migrated liquibase from v4 to v5.

And even after that I found another issue :

Looking at the source code of, i found 2 mentions of org.springframework.boot.autoconfigure.liquibase.LiquibaseProperties :

import org.springframework.beans.BeansException;
import org.springframework.beans.factory.config.BeanPostProcessor;
import org.springframework.boot.autoconfigure.liquibase.LiquibaseProperties; // <---
import org.springframework.core.Ordered;

public class LiquibasePropertiesPostProcessor implements BeanPostProcessor, Ordered {
    // ...
}

@Configuration
public class EmbeddedDatabaseAutoConfiguration implements BeanClassLoaderAware {
    // ...

    @Bean
    @Role(BeanDefinition.ROLE_INFRASTRUCTURE)
    @ConditionalOnClass(name = "org.springframework.boot.autoconfigure.liquibase.LiquibaseProperties") // <---
    @ConditionalOnMissingBean(name = "liquibasePropertiesPostProcessor")
    public LiquibasePropertiesPostProcessor liquibasePropertiesPostProcessor() {
        return new LiquibasePropertiesPostProcessor();
    }

    // ...
}

Unfortunately, Spring Boot 4 has renamed a lot of their autocofiguration package with their new modular model.

org.springframework.boot.autoconfigure.liquibase.LiquibaseProperties is now org.springframework.boot.liquibase.autoconfigure.LiquibaseProperties

My small hack consists in redefining the class io.zonky.test.db.config.EmbeddedDatabaseAutoConfiguration in my own application, with right import.

I did not need (yet) to override the bean liquibasePropertiesPostProcessor, but if i have to i'll probably do it the same way : Redefining the @Bean in my test @SpringBootApplication or test configuration, with the right full class name inside @ConditionalOnClass :

    @Bean
    @Role(BeanDefinition.ROLE_INFRASTRUCTURE)
    @ConditionalOnClass(name = "org.springframework.boot.liquibase.autoconfigure.LiquibaseProperties")
    @ConditionalOnMissingBean(name = "liquibasePropertiesPostProcessor")
    public LiquibasePropertiesPostProcessor liquibasePropertiesPostProcessor() {
        return new LiquibasePropertiesPostProcessor();
    }