I have done the migration of the Spring Boot Application from 1.5.8 to 2.1.14-RELEASE and using gradle as a build script. I am using spring-boot-gradle-plugin and spring-boot-dependency-management plugins. In our spring boot project, we are creating multiple executable jar files by creating tasks for each jar as below
// During Migration changed from Jar to BootJar
task eurekaAppJar(type: BootJar) {
baseName = 'eurekaJar'
version = '0.0.1'
println sourceSets.main.output
manifest {
attributes 'Main-Class': "org.springframework.boot.loader.JarLauncher"
attributes 'Start-Class': "com.abc.abcCompany.service.eurekaApp.EurekaApplication"
attributes 'Implementation-Version': "001"
}
bootJar {
mainClassName = "com.abc.abcCompany.service.eurekaApp.EurekaApplication"
}
from(sourceSets.main.output) {
}
}
// During Migration changed from Jar to BootJar
task oAuthConfigJar(type: BootJar) {
baseName = 'oAuthConfigJar'
version = '0.0.1'
manifest {
attributes 'Main-Class': "org.springframework.boot.loader.JarLauncher"
attributes 'Start-Class': "com.abc.abcCompany.service.authserver.AuthServerApplication"
attributes 'Implementation-Version': "001"
}
springBoot {
mainClassName = "com.abcCompany.service.authserver.AuthServerApplication"
}
from(sourceSets.main.output) {
}
}
// During migration changed from BootRepackage to BootJar
task eurekaBoot(type: BootJar, dependsOn: eurekaAppJar) {
mainClassName = 'com.abc.abcCompany.service.eurekaApp.EurekaApplication'
// During migration commented the below code
// customConfiguration = "eurekaconfiguration"
// withJarTask = eztrackerEurekaJar
}
// During migration changed from BootRepackage to BootJar
task oAuthConfigJarBoot(type: BootJar, dependsOn: oAuthConfigJar) {
println " Executing eztrackerApiGatewayBoot task"
mainClassName = 'com.abc.abcCompany.service.authserver.AuthServerApplication'
// During migration commented the below code
// customConfiguration = "zuulconfiguration"
// withJarTask = eztrackerApiGatewayJar
}
bootJar.dependsOn = [eurekaBoot, oAuthConfigJarBoot]
bootJar.enabled = false
In the above code after executing either gradle assemble, It has created two executable jar files eurekaJar-0.0.1.jar, oAuthConfigJar-0.0.1.jar.
Here is my question:
Before the spring boot migration, in the above jars the folder structure is as below:
eurekaJar-0.0.1.jar
-- org
-- META-INF
-- BOOT-INT
-- lib
-- dependencies (jars)
-- classes
-- applicationclasses
after the migration below is the folder structure
eurekaJar-0.0.1.jar -- org -- META-INF -- applicationclasses
so after the migration there is no BOOT-INF folder and dependencies(lib folder)
Because of the above issue my executable jar is not running.
Any comment is appreciated.
Rather than using from, which will add files directly to the jar, you should configure the classpath of the BootJar tasks. Jar files on the classpath will be packaged in BOOT-INF/lib and directories will be packaged in BOOT-INF/classes.
For reference, you can see how Spring Boot configures the classpath of the default bootJar task in its own plugin here. From what you’ve shown above, you probably want to use the runtime classpath of the main source set too.
Here's a complete example for your eurekaAppJar:
import org.springframework.boot.gradle.tasks.bundling.BootJar
plugins {
id 'org.springframework.boot' version '2.1.4.RELEASE'
id 'io.spring.dependency-management' version '1.0.11.RELEASE'
id 'java'
}
group = 'com.example'
version = '0.0.1-SNAPSHOT'
sourceCompatibility = '11'
repositories {
mavenCentral()
}
dependencies {
implementation 'org.springframework.boot:spring-boot-starter'
testImplementation 'org.springframework.boot:spring-boot-starter-test'
}
test {
useJUnitPlatform()
}
task eurekaAppJar(type: BootJar) {
baseName = 'eurekaJar'
version = '0.0.1'
manifest {
attributes 'Main-Class': "org.springframework.boot.loader.JarLauncher"
attributes 'Start-Class': "com.abc.abcCompany.service.eurekaApp.EurekaApplication"
attributes 'Implementation-Version': "001"
}
mainClassName = "com.abc.abcCompany.service.eurekaApp.EurekaApplication"
classpath sourceSets.main.runtimeClasspath
}
This jar can then be built with the following command:
$ ./gradlew eurekaAppJar
Its classes and dependencies are packaged in BOOT-INF/classes and BOOT-INF/lib respectively:
$ unzip -l build/libs/eurekaJar-0.0.1.jar
Archive: build/libs/eurekaJar-0.0.1.jar
Length Date Time Name
--------- ---------- ----- ----
0 04-04-2019 02:23 org/
0 04-04-2019 02:23 org/springframework/
0 04-04-2019 02:23 org/springframework/boot/
0 04-04-2019 02:23 org/springframework/boot/loader/
0 04-04-2019 02:23 org/springframework/boot/loader/data/
0 04-04-2019 02:23 org/springframework/boot/loader/jar/
0 04-04-2019 02:23 org/springframework/boot/loader/archive/
0 04-04-2019 02:23 org/springframework/boot/loader/util/
2688 04-04-2019 02:23 org/springframework/boot/loader/data/RandomAccessDataFile$DataInputStream.class
4976 04-04-2019 02:23 org/springframework/boot/loader/jar/AsciiBytes.class
540 04-04-2019 02:23 org/springframework/boot/loader/jar/CentralDirectoryVisitor.class
3263 04-04-2019 02:23 org/springframework/boot/loader/data/RandomAccessDataFile$FileAccess.class
4015 04-04-2019 02:23 org/springframework/boot/loader/data/RandomAccessDataFile.class
945 04-04-2019 02:23 org/springframework/boot/loader/archive/Archive.class
282 04-04-2019 02:23 org/springframework/boot/loader/data/RandomAccessDataFile$1.class
1593 04-04-2019 02:23 org/springframework/boot/loader/jar/JarFileEntries$1.class
299 04-04-2019 02:23 org/springframework/boot/loader/jar/JarEntryFilter.class
485 04-04-2019 02:23 org/springframework/boot/loader/data/RandomAccessData.class
616 04-04-2019 02:23 org/springframework/boot/loader/jar/Bytes.class
702 04-04-2019 02:23 org/springframework/boot/loader/jar/JarURLConnection$1.class
9854 04-04-2019 02:23 org/springframework/boot/loader/jar/JarURLConnection.class
1233 04-04-2019 02:23 org/springframework/boot/loader/jar/JarFile$2.class
1487 04-04-2019 02:23 org/springframework/boot/loader/archive/ExplodedArchive$FileEntryIterator$EntryComparator.class
3837 04-04-2019 02:23 org/springframework/boot/loader/archive/ExplodedArchive$FileEntryIterator.class
1102 04-04-2019 02:23 org/springframework/boot/loader/archive/ExplodedArchive$FileEntry.class
273 04-04-2019 02:23 org/springframework/boot/loader/archive/ExplodedArchive$1.class
5243 04-04-2019 02:23 org/springframework/boot/loader/archive/ExplodedArchive.class
1779 04-04-2019 02:23 org/springframework/boot/loader/archive/JarFileArchive$EntryIterator.class
1081 04-04-2019 02:23 org/springframework/boot/loader/archive/JarFileArchive$JarFileEntry.class
7336 04-04-2019 02:23 org/springframework/boot/loader/archive/JarFileArchive.class
19737 04-04-2019 02:23 org/springframework/boot/loader/PropertiesLauncher.class
1535 04-04-2019 02:23 org/springframework/boot/loader/LaunchedURLClassLoader$UseFastConnectionExceptionsEnumeration.class
4306 04-04-2019 02:23 org/springframework/boot/loader/jar/JarURLConnection$JarEntryName.class
5699 04-04-2019 02:23 org/springframework/boot/loader/LaunchedURLClassLoader.class
1374 04-04-2019 02:23 org/springframework/boot/loader/jar/JarFile$JarFileType.class
2062 04-04-2019 02:23 org/springframework/boot/loader/jar/JarFile$1.class
2046 04-04-2019 02:23 org/springframework/boot/loader/jar/JarFileEntries$EntryIterator.class
14010 04-04-2019 02:23 org/springframework/boot/loader/jar/JarFileEntries.class
3116 04-04-2019 02:23 org/springframework/boot/loader/jar/CentralDirectoryEndRecord.class
1813 04-04-2019 02:23 org/springframework/boot/loader/jar/ZipInflaterInputStream.class
302 04-04-2019 02:23 org/springframework/boot/loader/archive/Archive$Entry.class
437 04-04-2019 02:23 org/springframework/boot/loader/archive/Archive$EntryFilter.class
3662 04-04-2019 02:23 org/springframework/boot/loader/jar/JarEntry.class
5267 04-04-2019 02:23 org/springframework/boot/loader/jar/CentralDirectoryFileHeader.class
4624 04-04-2019 02:23 org/springframework/boot/loader/jar/CentralDirectoryParser.class
11548 04-04-2019 02:23 org/springframework/boot/loader/jar/Handler.class
3650 04-04-2019 02:23 org/springframework/boot/loader/jar/StringSequence.class
345 04-04-2019 02:23 org/springframework/boot/loader/jar/FileHeader.class
15076 04-04-2019 02:23 org/springframework/boot/loader/jar/JarFile.class
1953 04-04-2019 02:23 org/springframework/boot/loader/PropertiesLauncher$PrefixMatchingArchiveFilter.class
1484 04-04-2019 02:23 org/springframework/boot/loader/PropertiesLauncher$ArchiveEntryFilter.class
266 04-04-2019 02:23 org/springframework/boot/loader/PropertiesLauncher$1.class
4684 04-04-2019 02:23 org/springframework/boot/loader/Launcher.class
1502 04-04-2019 02:23 org/springframework/boot/loader/MainMethodRunner.class
3608 04-04-2019 02:23 org/springframework/boot/loader/ExecutableArchiveLauncher.class
1721 04-04-2019 02:23 org/springframework/boot/loader/WarLauncher.class
1585 04-04-2019 02:23 org/springframework/boot/loader/JarLauncher.class
5203 04-04-2019 02:23 org/springframework/boot/loader/util/SystemPropertyUtils.class
0 07-15-2021 13:15 META-INF/
288 07-15-2021 13:15 META-INF/MANIFEST.MF
0 07-15-2021 13:15 BOOT-INF/
0 07-15-2021 13:15 BOOT-INF/classes/
0 07-15-2021 13:15 BOOT-INF/classes/com/
0 07-15-2021 13:15 BOOT-INF/classes/com/example/
0 07-15-2021 13:15 BOOT-INF/classes/com/example/so68382900/
745 07-15-2021 13:15 BOOT-INF/classes/com/example/so68382900/DemoApplication.class
1 07-15-2021 13:14 BOOT-INF/classes/application.properties
0 07-15-2021 13:15 BOOT-INF/lib/
398 07-15-2021 13:15 BOOT-INF/lib/spring-boot-starter-2.1.4.RELEASE.jar
1262787 07-15-2021 13:15 BOOT-INF/lib/spring-boot-autoconfigure-2.1.4.RELEASE.jar
952263 07-15-2021 13:15 BOOT-INF/lib/spring-boot-2.1.4.RELEASE.jar
407 07-15-2021 13:15 BOOT-INF/lib/spring-boot-starter-logging-2.1.4.RELEASE.jar
26586 06-26-2020 11:02 BOOT-INF/lib/javax.annotation-api-1.3.2.jar
1099880 07-15-2021 13:15 BOOT-INF/lib/spring-context-5.1.6.RELEASE.jar
369018 07-15-2021 13:15 BOOT-INF/lib/spring-aop-5.1.6.RELEASE.jar
673302 07-15-2021 13:15 BOOT-INF/lib/spring-beans-5.1.6.RELEASE.jar
280482 07-15-2021 13:15 BOOT-INF/lib/spring-expression-5.1.6.RELEASE.jar
1293481 07-15-2021 13:15 BOOT-INF/lib/spring-core-5.1.6.RELEASE.jar
301298 07-15-2021 13:15 BOOT-INF/lib/snakeyaml-1.23.jar
290339 06-26-2020 11:01 BOOT-INF/lib/logback-classic-1.2.3.jar
17522 07-15-2021 13:15 BOOT-INF/lib/log4j-to-slf4j-2.11.2.jar
4589 07-15-2021 13:15 BOOT-INF/lib/jul-to-slf4j-1.7.26.jar
23762 07-15-2021 13:15 BOOT-INF/lib/spring-jcl-5.1.6.RELEASE.jar
471901 06-26-2020 11:01 BOOT-INF/lib/logback-core-1.2.3.jar
41139 06-26-2020 11:01 BOOT-INF/lib/slf4j-api-1.7.26.jar
266283 07-15-2021 13:15 BOOT-INF/lib/log4j-api-2.11.2.jar
--------- -------
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