\n * This constructor validates that at least one database configuration is provided and that all\n * configurations are non-null. Use the {@link Builder} class for more convenient configuration\n * with default values.\n *
\n * @param databaseConfigs array of database configurations defining the available Redis endpoints\n * @throws JedisValidationException if databaseConfigs is null or empty\n * @throws IllegalArgumentException if any database configuration is null\n * @see Builder#Builder(DatabaseConfig[])\n */\n public MultiDbConfig(DatabaseConfig[] databaseConfigs) {\n\n if (databaseConfigs == null || databaseConfigs.length < 1) throw new JedisValidationException(\n \"DatabaseClientConfigs are required for MultiDbConnectionProvider\");\n\n for (DatabaseConfig databaseConfig : databaseConfigs) {\n if (databaseConfig == null)\n throw new IllegalArgumentException(\"DatabaseClientConfigs must not contain null elements\");\n }\n this.databaseConfigs = databaseConfigs;\n }\n\n /**\n * Returns the array of database configurations defining available Redis endpoints.\n * @return array of database configurations, never null or empty\n */\n public DatabaseConfig[] getDatabaseConfigs() {\n return databaseConfigs;\n }\n\n /**\n * Returns the encapsulated retry configuration for command execution.\n *\n * This provides access to all retry-related settings through a single configuration object.\n *
\n * @return retry configuration, never null","sourceCodeStart":665,"sourceCodeEnd":701,"githubUrl":"https://github.com/redis/jedis/blob/6dac31d4c224fb3257c216f3985340c6f500cdcb/src/main/java/redis/clients/jedis/MultiDbConfig.java#L665-L701","documentation":"After the null/empty check, MultiDbConfig's constructor iterates the array and rejects any null element with IllegalArgumentException(\"DatabaseClientConfigs must not contain null elements\"), since a null slot cannot define a usable database.","triggerScenarios":"new MultiDbConfig(new DatabaseConfig[]{cfg1, null, cfg3}) — building the array by index or from a collection converted with toArray on a sized-but-partially-filled array, leaving null slots.","commonSituations":"Arrays pre-allocated with a fixed size but only partially populated; optional database configs filtered out but null placeholders left behind; deserializing config lists with missing entries.","solutions":["Filter out null elements before constructing MultiDbConfig","Use a List and toArray(new DatabaseConfig[0]) to avoid trailing/interior nulls from pre-sized arrays","Validate each element is non-null when assembling the array"],"exampleFix":"// before\nDatabaseConfig[] cfgs = new DatabaseConfig[3];\ncfgs[0] = db1; cfgs[2] = db3; // cfgs[1] is null\nMultiDbConfig config = new MultiDbConfig(cfgs); // IllegalArgumentException\n// after\nList