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Configuration Options

No Key Type Description Default Value Since Supports Repo ID suffix Source
1. "aether.artifactResolver.postProcessor.trustedChecksums" java.lang.Boolean Is post processor enabled. false 1.9.0 No Session Configuration
2. "aether.artifactResolver.postProcessor.trustedChecksums.checksumAlgorithms" java.lang.String The checksum algorithms to apply during post-processing as comma separated list. "SHA-1" 1.9.0 No Session Configuration
3. "aether.artifactResolver.postProcessor.trustedChecksums.failIfMissing" java.lang.Boolean Should post processor fail resolution if checksum is missing? false 1.9.0 No Session Configuration
4. "aether.artifactResolver.postProcessor.trustedChecksums.record" java.lang.Boolean Should post processor go into “record” mode (and collect checksums instead of validate them)? false 1.9.0 No Session Configuration
5. "aether.artifactResolver.postProcessor.trustedChecksums.snapshots" java.lang.Boolean Should post processor process snapshots as well? false 1.9.0 No Session Configuration
6. "aether.artifactResolver.simpleLrmInterop" java.lang.Boolean Configuration to enable “interoperability” with Simple LRM, but this breaks RRF feature, hence this configuration is IGNORED when RRF is used, and is warmly recommended to leave it disabled even if no RRF is being used. false No Session Configuration
7. "aether.artifactResolver.snapshotNormalization" java.lang.Boolean Configuration to enable “snapshot normalization”, downloaded snapshots from remote with timestamped file names will have file names converted back to baseVersion. It replaces the timestamped snapshot file name with a filename containing the SNAPSHOT qualifier only. This only affects resolving/retrieving artifacts but not uploading those. true No Session Configuration
8. "aether.chainedLocalRepository.ignoreTailAvailability" java.lang.Boolean When using chained local repository, should be the artifact availability ignored in tail. true 1.9.2 No Session Configuration
9. "aether.conflictResolver.verbose" java.lang.Object The key in the repository session's used to store a flag controlling the transformer's verbose mode. Accepted values are Boolean types, String type (where “true” would be interpreted as ) or Verbosity enum instances. "NONE" No Session Configuration
10. "aether.connector.basic.parallelPut" java.lang.Boolean Enables or disables parallel PUT processing (parallel deploys) on basic connector globally or per remote repository. When disabled, connector behaves exactly as in Maven 3.8.x did: GETs are parallel while PUTs are sequential. true 1.9.5 Yes Session Configuration
11. "aether.connector.basic.persistedChecksums" java.lang.Boolean Flag indicating whether checksums which are retrieved during checksum validation should be persisted in the local repository next to the file they provide the checksum for. true 0.9.0.M4 No Session Configuration
12. "aether.connector.basic.smartChecksums" java.lang.Boolean Flag indicating that instead of comparing the external checksum fetched from the remote repo with the calculated one, it should try to extract the reference checksum from the actual artifact response headers This only works for HTTP transports. true 0.9.0.M3 No Session Configuration
13. "aether.connector.basic.threads" java.lang.Integer Flag indicating whether checksums which are retrieved during checksum validation should be persisted in the local repository next to the file they provide the checksum for. 5 0.9.0.M4 No Session Configuration
14. "aether.dependencyCollector.bf.skipper" java.lang.Boolean The key in the repository session's used to store a flag controlling the resolver's skip mode. true 1.8.0 No Session Configuration
15. "aether.dependencyCollector.bf.threads" java.lang.Integer The count of threads to be used when collecting POMs in parallel. 5 1.9.0 No Session Configuration
16. "aether.dependencyCollector.impl" java.lang.String The name of the dependency collector implementation to use: depth-first (original) named “df”, and breadth-first (new in 1.8.0) named “bf”. Both collectors produce equivalent results, but they may differ performance wise, depending on project being applied to. Our experience shows that existing “df” is well suited for smaller to medium size projects, while “bf” may perform better on huge projects with many dependencies. Experiment (and come back to us!) to figure out which one suits you the better. "bf" 1.8.0 No Session Configuration
17. "aether.dependencyCollector.maxCycles" java.lang.Integer Only up to the given amount cyclic dependencies are emitted. 10 1.8.0 No Session Configuration
18. "aether.dependencyCollector.maxExceptions" java.lang.Integer Only exceptions up to the number given in this configuration property are emitted. Exceptions which exceed that number are swallowed. 50 1.8.0 No Session Configuration
19. "aether.dependencyCollector.pool.artifact" java.lang.String Flag controlling interning data pool type used by dependency collector for Artifact instances, matters for heap consumption. By default, uses “weak” references (consume less heap). Using “hard” will make it much more memory aggressive and possibly faster (system and Java dependent). Supported values: “hard”, “weak”. "weak" 1.9.5 No Session Configuration
20. "aether.dependencyCollector.pool.dependency" java.lang.String Flag controlling interning data pool type used by dependency collector for Dependency instances, matters for heap consumption. By default, uses “weak” references (consume less heap). Using “hard” will make it much more memory aggressive and possibly faster (system and Java dependent). Supported values: “hard”, “weak”. "weak" 1.9.5 No Session Configuration
21. "aether.dependencyCollector.pool.descriptor" java.lang.String Flag controlling interning data pool type used by dependency collector for ArtifactDescriptor (POM) instances, matters for heap consumption. By default, uses “weak” references (consume less heap). Using “hard” will make it much more memory aggressive and possibly faster (system and Java dependent). Supported values: “hard”, “weak”. "hard" 1.9.5 No Session Configuration
22. "aether.dependencyManager.verbose" java.lang.Boolean The key in the repository session's used to store a flag controlling the verbose mode for dependency management. If enabled, the original attributes of a dependency before its update due to dependency management will be recorded * in the node's when building a dependency graph. false No Session Configuration
23. "aether.interactive" java.lang.Boolean A flag indicating whether interaction with the user is allowed. false No Session Configuration
24. "aether.layout.maven2.checksumAlgorithms" java.lang.String Comma-separated list of checksum algorithms with which checksums are validated (downloaded) and generated (uploaded) with this layout. Resolver by default supports following algorithms: MD5, SHA-1, SHA-256 and SHA-512. New algorithms can be added by implementing ChecksumAlgorithmFactory component. "SHA-1,MD5" 1.8.0 No Session Configuration
25. "aether.layout.maven2.omitChecksumsForExtensions" java.lang.String Comma-separated list of extensions with leading dot (example “.asc”) that should have checksums omitted. These are applied to sub-artifacts only. Note: to achieve 1.7.x aether.checksums.forSignature=true behaviour, pass empty string as value for this property. ".asc,.sigstore" 1.8.0 No Session Configuration
26. "aether.lrm.enhanced.localPrefix" java.lang.String The prefix to use for locally installed artifacts. "installed" 1.8.1 No Session Configuration
27. "aether.lrm.enhanced.releasesPrefix" java.lang.String The prefix to use for release artifacts. "releases" 1.8.1 No Session Configuration
28. "aether.lrm.enhanced.remotePrefix" java.lang.String The prefix to use for remotely cached artifacts. "cached" 1.8.1 No Session Configuration
29. "aether.lrm.enhanced.snapshotsPrefix" java.lang.String The prefix to use for snapshot artifacts. "snapshots" 1.8.1 No Session Configuration
30. "aether.lrm.enhanced.split" java.lang.Boolean Whether LRM should split local and remote artifacts. false 1.8.1 No Session Configuration
31. "aether.lrm.enhanced.splitLocal" java.lang.Boolean Whether locally installed artifacts should be split by version (release/snapshot). false 1.8.1 No Session Configuration
32. "aether.lrm.enhanced.splitRemote" java.lang.Boolean Whether cached artifacts should be split by version (release/snapshot). false 1.8.1 No Session Configuration
33. "aether.lrm.enhanced.splitRemoteRepository" java.lang.Boolean Whether cached artifacts should be split by origin repository (repository ID). false 1.8.1 No Session Configuration
34. "aether.lrm.enhanced.splitRemoteRepositoryLast" java.lang.Boolean For cached artifacts, if both splitRemote and splitRemoteRepository are set to true sets the splitting order: by default it is repositoryId/version (false) or version/repositoryId (true) false 1.8.1 No Session Configuration
35. "aether.lrm.enhanced.trackingFilename" java.lang.String Filename of the file in which to track the remote repositories. "_remote.repositories" No Session Configuration
36. "aether.metadataResolver.threads" java.lang.Integer Number of threads to use in parallel for resolving metadata. 4 0.9.0.M4 No Session Configuration
37. "aether.named.diagnostic.enabled" java.lang.Boolean System property key to enable locking diagnostic collection. false 1.9.11 No Java System Properties
38. "aether.named.file-lock.attempts" java.lang.Integer Tweak: on Windows, the presence of causes concurrency issues. This flag allows to implement similar fix as referenced JDK bug report: retry and hope the best. Default value is 5 attempts (will retry 4 times). 5 1.7.3 No Java System Properties
39. "aether.named.file-lock.deleteLockFiles" java.lang.Boolean Tweak: on Windows, the presence of causes concurrency issues. This flag allows to have it removed from effective flags, at the cost that lockfile directory becomes crowded with 0 byte sized lock files that are never cleaned up. Default value is . true 1.7.3 No Java System Properties
40. "aether.named.file-lock.sleepMillis" java.lang.Long Tweak: When used, the amount of milliseconds to sleep between subsequent retries. Default value is 50 milliseconds. 50 1.7.3 No Java System Properties
41. "aether.offline.hosts" java.lang.String Comma-separated list of hosts which are supposed to be resolved offline. - No Session Configuration
42. "aether.offline.protocols" java.lang.String Comma-separated list of protocols which are supposed to be resolved offline. - No Session Configuration
43. "aether.priority.cached" java.lang.Boolean A flag indicating whether the created ordered components should be cached in session. true 2.0.0 No Session Configuration
44. "aether.priority.implicit" java.lang.Boolean A flag indicating whether the priorities of pluggable extensions are implicitly given by their iteration order such that the first extension has the highest priority. If set, an extension's built-in priority as well as any corresponding configuration properties are ignored when searching for a suitable implementation among the available extensions. This priority mode is meant for cases where the application will present/inject extensions in the desired search order. false No Session Configuration
45. "aether.remoteRepositoryFilter.groupId" java.lang.Boolean Is filter enabled? false 1.9.0 No Session Configuration
46. "aether.remoteRepositoryFilter.groupId.basedir" java.lang.String The basedir where to store filter files. If path is relative, it is resolved from local repository root. ".remoteRepositoryFilters" 1.9.0 No Session Configuration
47. "aether.remoteRepositoryFilter.groupId.record" java.lang.Boolean Should filter go into “record” mode (and collect encountered artifacts)? false 1.9.0 No Session Configuration
48. "aether.remoteRepositoryFilter.prefixes" java.lang.Boolean Is filter enabled? false 1.9.0 No Session Configuration
49. "aether.remoteRepositoryFilter.prefixes.basedir" java.lang.String The basedir where to store filter files. If path is relative, it is resolved from local repository root. ".remoteRepositoryFilters" 1.9.0 No Session Configuration
50. "aether.snapshotFilter" java.lang.Boolean The key in the repository session's used to store a flag whether this filter should be forced to ban snapshots. By default, snapshots are only filtered if the root artifact is not a snapshot. false No Session Configuration
51. "aether.syncContext.named.basedir.locksDir" java.lang.String The location of the directory toi use for locks. If relative path, it is resolved from the local repository root. ".locks" 1.9.0 No Session Configuration
52. "aether.syncContext.named.discriminating.discriminator" java.lang.String Configuration property to pass in discriminator, if needed. If not present, it is auto-calculated. - 1.7.0 No Session Configuration
53. "aether.syncContext.named.discriminating.hostname" java.lang.String Configuration property to pass in hostname, if needed. If not present, hostname as reported by system will be used. - 1.7.0 No Session Configuration
54. "aether.syncContext.named.factory" java.lang.String Name of the lock factory to use in session. "rwlock-local" 1.9.1 No Session Configuration
55. "aether.syncContext.named.hashing.depth" java.lang.Integer The depth how many levels should adapter create. Acceptable values are 0-4 (inclusive). 2 1.9.0 No Session Configuration
56. "aether.syncContext.named.nameMapper" java.lang.String Name of the name mapper to use in session. Out of the box supported ones are “static”, “gav”, “file-gav”, “file-hgav”, “file-static” and “discriminating”. "gav" 1.9.1 No Session Configuration
57. "aether.syncContext.named.redisson.configFile" java.lang.String Path to a Redisson configuration file in YAML format. Read official documentation for details. - 1.7.0 No Java System Properties
58. "aether.syncContext.named.retry" java.lang.Integer The amount of retries on time-out. 1 1.7.0 No Session Configuration
59. "aether.syncContext.named.retry.wait" java.lang.Long The amount of milliseconds to wait between retries on time-out. 200 1.7.0 No Session Configuration
60. "aether.syncContext.named.time" java.lang.Long The maximum of time amount to be blocked to obtain lock. 30 1.7.0 No Session Configuration
61. "aether.syncContext.named.time.unit" java.lang.String The unit of maximum time amount to be blocked to obtain lock. Use TimeUnit enum names. "SECONDS" 1.7.0 No Session Configuration
62. "aether.system.dependencyVisitor" java.lang.String A flag indicating which visitor should be used to “flatten” the dependency graph into list. Default is same as in older resolver versions “preOrder”, while it can accept values like “postOrder” and “levelOrder”. "preOrder" 2.0.0 No Session Configuration
63. "aether.transport.apache.https.cipherSuites" java.lang.String Comma-separated list of Cipher Suites which are enabled for HTTPS connections. - 2.0.0 No Session Configuration
64. "aether.transport.apache.https.protocols" java.lang.String Comma-separated list of Protocols which are enabled for HTTPS connections. - 2.0.0 No Session Configuration
65. "aether.transport.apache.retryHandler.name" java.lang.String The name of retryHandler, supported values are “standard”, that obeys RFC-2616, regarding idempotent methods, and “default” that considers requests w/o payload as idempotent. "standard" 2.0.0 Yes Session Configuration
66. "aether.transport.apache.retryHandler.requestSentEnabled" java.lang.Boolean Set to true if it is acceptable to retry non-idempotent requests, that have been sent. false 2.0.0 Yes Session Configuration
67. "aether.transport.apache.useSystemProperties" java.lang.Boolean If enabled, underlying Apache HttpClient will use system properties as well to configure itself (typically used to set up HTTP Proxy via Java system properties). See HttpClientBuilder for used properties. This mode is not recommended, better use documented ways of configuration instead. false 2.0.0 Yes Session Configuration
68. "aether.transport.classpath.loader" java.lang.ClassLoader The key in the repository session's used to store a from which resources should be retrieved. If unspecified, the of the current thread will be used. - No Session Configuration
69. "aether.transport.http.connectTimeout" java.lang.Integer The maximum amount of time (in milliseconds) to wait for a successful connection to a remote server. Non-positive values indicate no timeout. 10000 Yes Session Configuration
70. "aether.transport.http.connectionMaxTtl" java.lang.Integer Total time to live in seconds for an HTTP connection, after that time, the connection will be dropped (no matter for how long it was idle). 300 1.9.8 Yes Session Configuration
71. "aether.transport.http.credentialEncoding" java.lang.String The encoding/charset to use when exchanging credentials with HTTP servers. Besides this general key, clients may also specify the encoding for a specific remote repository by appending the suffix to this key when storing the charset name. "ISO-8859-1" Yes Session Configuration
72. "aether.transport.http.expectContinue" java.lang.Boolean Boolean flag should the HTTP transport use expect-continue handshake for PUT requests. Not all transport support this option. This option may be needed for some broken HTTP servers. Default value corresponds to given transport default one (resolver does not override those), but if configuration IS given, it will replace given transport own default value. - 1.9.17 Yes Session Configuration
73. "aether.transport.http.headers" java.util.Map The request headers to use for HTTP-based repository connectors. The headers are specified using a , mapping a header name to its value. Besides this general key, clients may also specify headers for a specific remote repository by appending the suffix to this key when storing the headers map. The repository-specific headers map is supposed to be complete, i.e. is not merged with the general headers map. - Yes Session Configuration
74. "aether.transport.http.localAddress" java.lang.String The local address (interface) to use with HTTP transport. Not all transport supports this option. - 2.0.0 Yes Session Configuration
75. "aether.transport.http.maxConnectionsPerRoute" java.lang.Integer The maximum concurrent connections per route HTTP client is allowed to use. 50 1.9.8 Yes Session Configuration
76. "aether.transport.http.preemptiveAuth" java.lang.Boolean Should HTTP client use preemptive-authentication for all HTTP verbs (works only w/ BASIC). By default, is disabled, as it is considered less secure. false 1.9.6 Yes Session Configuration
77. "aether.transport.http.preemptivePutAuth" java.lang.Boolean Boolean flag should the HTTP transport use preemptive-auth for PUT requests. Not all transport support this option. true 2.0.0 (moved out from maven-resolver-transport-http). Yes Session Configuration
78. "aether.transport.http.requestTimeout" java.lang.Integer The maximum amount of time (in milliseconds) to wait for remaining data to arrive from a remote server. Note that this timeout does not restrict the overall duration of a request, it only restricts the duration of inactivity between consecutive data packets. Non-positive values indicate no timeout. 1800000 Yes Session Configuration
79. "aether.transport.http.retryHandler.count" java.lang.Integer The maximum number of times a request to a remote server should be retried in case of an error. 3 1.9.6 Yes Session Configuration
80. "aether.transport.http.retryHandler.interval" java.lang.Long The initial retry interval in millis of request to a remote server should be waited in case of “too many requests” (HTTP codes 429 and 503). Accepts long as milliseconds. This value is used if remote server does not use header, in which case Server value is obeyed. 5000 1.9.16 Yes Session Configuration
81. "aether.transport.http.retryHandler.intervalMax" java.lang.Long The maximum retry interval in millis of request to a remote server above which the request should be aborted instead. In theory, a malicious server could tell Maven “come back after 100 years” that would stall the build for some. Using this parameter Maven will fail the request instead, if interval is above this value. 300000 1.9.16 Yes Session Configuration
82. "aether.transport.http.retryHandler.serviceUnavailable" java.lang.String The HTTP codes of remote server responses that should be handled as “too many requests” (examples: HTTP codes 429 and 503). Accepts comma separated list of HTTP response codes. "429,503" 1.9.16 Yes Session Configuration
83. "aether.transport.http.reuseConnections" java.lang.Boolean Should HTTP client reuse connections (in other words, pool connections) or not? true 1.9.8 Yes Session Configuration
84. "aether.transport.http.supportWebDav" java.lang.Boolean Boolean flag should the HTTP transport support WebDAV remote. Not all transport support this option. false 2.0.0 (moved out from maven-resolver-transport-http). Yes Session Configuration
85. "aether.transport.http.userAgent" java.lang.String The user agent that repository connectors should report to servers. "Aether" No Session Configuration
86. "aether.transport.https.securityMode" java.lang.String The mode that sets HTTPS transport “security mode”: to ignore any SSL errors (certificate validity checks, hostname verification). The default value is . "default" 1.9.6 Yes Session Configuration
87. "aether.transport.jdk.httpVersion" java.lang.String Use string representation of HttpClient version enum “HTTP_2” or “HTTP_1_1” to set default HTTP protocol to use. "HTTP_2" 2.0.0 Yes Session Configuration
88. "aether.transport.wagon.config" java.lang.Object The configuration to use for the Wagon provider. - Yes Session Configuration
89. "aether.transport.wagon.perms.dirMode" java.lang.String Octal numerical notation of permissions to set for newly created directories. Only considered by certain Wagon providers. - Yes Session Configuration
90. "aether.transport.wagon.perms.fileMode" java.lang.String Octal numerical notation of permissions to set for newly created files. Only considered by certain Wagon providers. - Yes Session Configuration
91. "aether.transport.wagon.perms.group" java.lang.String Group which should own newly created directories/files. Only considered by certain Wagon providers. - Yes Session Configuration
92. "aether.trustedChecksumsSource.sparseDirectory" java.lang.Boolean Is checksum source enabled? false 1.9.0 No Session Configuration
93. "aether.trustedChecksumsSource.sparseDirectory.basedir" java.lang.String The basedir where checksums are. If relative, is resolved from local repository root. ".checksums" 1.9.0 No Session Configuration
94. "aether.trustedChecksumsSource.sparseDirectory.originAware" java.lang.Boolean Is source origin aware? true 1.9.0 No Session Configuration
95. "aether.trustedChecksumsSource.summaryFile" java.lang.Boolean Is checksum source enabled? false 1.9.0 No Session Configuration
96. "aether.trustedChecksumsSource.summaryFile.basedir" java.lang.String The basedir where checksums are. If relative, is resolved from local repository root. ".checksums" 1.9.0 No Session Configuration
97. "aether.trustedChecksumsSource.summaryFile.originAware" java.lang.Boolean Is source origin aware? true 1.9.0 No Session Configuration
98. "aether.updateCheckManager.sessionState" java.lang.String Manages the session state, i.e. influences if the same download requests to artifacts/metadata will happen multiple times within the same RepositorySystemSession. If “enabled” will enable the session state. If “bypass” will enable bypassing (i.e. store all artifact ids/metadata ids which have been updates but not evaluating those). All other values lead to disabling the session state completely. "enabled" No Session Configuration

All properties which have yes in the column Supports Repo ID Suffix can be optionally configured specifically for a repository id. In that case the configuration property needs to be suffixed with a period followed by the repository id of the repository to configure, e.g. aether.connector.http.headers.central for repository with id central.

Property Type Conversion

If the value is not given in the target type the following conversions are applied.

From To With
String boolean Boolean.parseBoolean(...)
String int Integer.parseInt(...)
String long Long.parseLong(...)
String float Float.parseFloat(...)

Set Configuration from Apache Maven

To set one of the configuration options from above just use system variables. As system variables only support String values the type conversion mentioned above needs to be leveraged. Sometimes Maven uses different default values than the Maven Resolver itself or tries to extract certain values from the settings.xml. For details refer to https://github.com/apache/maven/blob/master/maven-core/src/main/java/org/apache/maven/internal/aether/DefaultRepositorySystemSessionFactory.java.